These are  the sheetmusic you asked me to find and the sites where I found them. Perhaps it will help others too...

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ALBENIZ ISAAC

Asturias N°5 de la suite espagnole opus 47 PDF (Free)
Suite espagnole (Free) on Sheetmusicarchives

ALBINONI TOMASO

Adagio in sol minor Albinoni (Free)
arr. by Daniel Taupin for clarinett (or violin) and organ ou arrangement (Free)

Adagio on partitions gratuites (Free)
Sonata da Chiesa (Free) PDF on Werner Icking Archives

BACH J.S

Prelude et Fugue pour orgue en C Minor BWV 546
ARIOSO ((Free)
Toccata and Fugue in Dminor BWV 565  
On  The Sheetmusicarchive.   (Free) 
Christmas Oratorio
BWV 659 Nun komm, der Heiden Heiland (Free)
J.S. Bach's Church Cantatas (Free)
Click here  to listen to the piece music
Cantata BWV11 (Free)
Cantata BWV 43 (Free)
Cantata BWV 48 (Free)
Cantate BWV 147 Jesus bleibet meine Freude , Jesu, Joy of man's desiring Jésus que ma joie demeure (Free)
Cantates BW 201-2116 (Free)
Fugue Livre 1 Fugue 2 (Free)
Book 2 Fugue 2 (Free)
Die Kunst der Fuge - Art of Fugue (BWV1080).(Free)
See also les Canons (Free) and an interesting article on this piece of music.

125 free pieces on IMSLP
Bach Busoni Piano transcription

BEETHOVEEN

Fur Elise by Beethoven (Free)-Pdf
Complete Beethoven Orchestra Works
Symphony n°5 C minor Beethoven Piano Reduction PDF (Free)
Symphony No. 6 in F Major Opus 68 (Free)
Symphony N° 9 in D Minor by Beethoven (Free)
ou Music scores (Free)pdf  
Ode to Joy Sheetmusicusa
Sonates Beethoven Free
or
Opus 27 n°2 for piano n°14 do dièse mineur "Moonlight sonata" 1801
Sonata No. 1 in F major, Op. 5, No. 1 (Fournier) (Paying)
200 free pieces on IMSLP

BERKELEY LENNOX
Concert Study in E flat
 This society   may be able to advise . They say on the site that the work you look for can be found at Schott publishers
BERLIOZ LOUIS HECTOR
BIZET GEORGE

La Toupie (Free)
La Poupée (Free) from "Jeux d'enfants"
L'Arlésienne (Free)
Carmen Complete opera Vocal score

BRAHMS JONANNES
BURGMULLER FRIEDRICH
Arabesque op 100 (free)
First, have a look at this site
BYSTROM THOMAS
DAQUIN LOUIS CLAUDE
Coucou (Free) on Metronimo (First download this Myriad free plug in to print the score)
DEBUSSY CLAUDE
DONIZETTI
Allegro en Ut majeur. To be bought on line at Sheetmusicplus
Lucrèce Borgia by Donizetti (Free)
 
DUKAS PAUL
DVORAK ANTONIN

Slavonic Dances Op. 46 (Free)
Slavonic dance N° 8 (Free) PDF

FAURE GABRIEL

Berceuse " Dolly" (Free)  8notes.com
Here is a link to a free midi file
Pavane pour piano à 4 mains. (version piano seul +version orchestre, DEMETS 1909" sur ce site
Sicilienne (Free)

FRANCK CESAR
Panis Angelicus for Piano by César Franck (Free)
GERSHWIN GEORGE

Rhapsody in blues on Piano.ru PDF ( Free) OR
see also imslp

GLUCK CRISTOPH
Dance of the Blessed Spirits By Christoph Willibald von Gluck.
Edited by Dale Tucker. Piano solo: Advanced Piano. Level: advanced. 8 pages.
Warner Brothers. (0116DP1X) $3.95
Sheet Music Plus
GOUNOD CHARLES
Ave Maria (Free ) PDF
Ave Maria Transcription for trompette (Free)
Ave Maria transcription for organ solo (Free)
Messe solennelle of Sainte Cécile by Gounod version orchestrale (full score) (Paying)
Les septs paroles du Christ (Paying) to be searched amongst this list of Gounod's publishers on Charles Gounod site
GRANADOS

Danse Espagnole n°5 on Sheetmusicarchives click on Granados (Free)
Danse Espagnole N° 10 (Free) by Enrique Granados on The Guitar School

GRIEG EDVARD

Holberg Suite
Elegie (Free) PDF
Concerto en A mineur opus 16--Theme-Transcription for piano (Paying)

HAENDEL GEORGE

Water Music
8notes.com (Free) Extract Pdf
Lascia ch'io pianga (Rinaldo) (Free)
Thine is the glory from Judas Maccabe (Paying) Sheetmusic.com
Concerto in Bb Major opus 4 N°6 (Free)
Sarabande (Free) on Sheetmusicarchives
Passacaille by Haendel (Free) pdf
Choral Works by Haendel (Free)

HAYDN JOSEPH
WALDEN HUGHES
Orange Etude MIDI  (Solo)
This piece is performed with an orange in the right hand (employs both"rolling" technique and "squashing" technique). The link seems to be broken
(http://people.nnu.edu/wdhughes/Orange.mid) and its best to contat the author  wdhughes@NNU.edu 
JELOBINSKY
Nocturne Opus 19 on sheetmusic plus
LISZT F

Etude de Concert N°1 in A Flat Major Il Lamento
Funérailles (Free) on sheetmusic archives clik on Liszt, then Funérailles
Sonetto 104 del Petrarca (Paying)
Bagatelle sans tonalité

MASSENET JULES
MENDELSOHN FELIX

Rondo Capriccioso, Op. 14
Sheet Music Plus Piano Solo. Arranged by Alfred Cortot. Piano Large Works (Arranged for piano). Published by Salabert. (50399620)
Chanson de printemps (Free)
To be bought on line from Sheetmusic plus
Chanson de printemps,sib By Felix Mendelssohn. Arranged by Porret. Trompette (Avec piano). Level: intermediate (grade 4). Published by Editions Robert Martin (French import). (1434)
Venetian Boat song (Free)
Marche nuptiale (Free)
Romances sans paroles by Felix Mendelssohn (Free) or "Songs without words" op.19b (Free)
Gondoles Venitiennes (Free)

MOSKOWSKI MORITZ
MUSSORGSKY MODEST
MOZART

Petite musique de nuit  (Free)
8notes 
Trio des Quilles pour piano (KV 498)
Pour Tenor et  Piano : PER PIETA NON RICERCATE K420.
To be ordered from Breitkof   and  Hartel 
Per pietà, non ricercate KV 420 Arie zu P. Anfossis Oper "Il curioso indiscreto" – T,Orch – 7'
Turkish March
Don Giovanni Ouverture Acte I and II (Free)
2ème air de la reine de la nuit from Act II de la flûte enchantée
(Free)
L'enlèvement au sérail - Die Entführung aus dem Serail by Mozart. (Free)
Concerto for piano N° 21 K 467 (Free)
Sonate N°331 (Rondo Alla Turc) Mozart (Free) on Sheetmusicarchives
Rondo from Sonata K545 ( Free) on sheetmusicarchives
Piano Concerto N° 21 in C 2nd Movment by Mozart (Free) pdf (used in Elvira Madigan)
2nd Movment concerto KV 622 for Clarinet by Mozart.(Free) pdf
See Digital Mozart Edition
Mozart on sheetmusicarchives
Mozart on 8notes 
Mozart on Werner Icking Music Archives

MUSSORGSKY MODEST
OFFENBACH JACQUES
La Périchole
Extract : "je suis grise"
Ah quel dîner, je viens de faire, et quel vin extraordinaire. J'en ai tant
bu, mais tant, tant, tant, que je crois bien que maintenant : je suis un peu
grise, un peu grise, mais chut, faut pu'on le dise chut.....)
Composer: Jacques OFFENBACH Annotation: HENRY MEILHAC
Titre: LA PERICHOLE Sous-titre: Livrets collection librairie théatrale
Editeur: BILLAUDOT Référence: lv0106 Type de matériel: N/A
Prix : 57.80 FRF 8.81 EUR
Instrument(s): Divers : Autres
Amazon
PERICHOLE PUBLISHER: Boosey & Hawkes
COMPOSER: OFFENBACH, J. INSTRUMENT: Opera, Vocal, Ensemble $6.25
Cancan (Free )
Belle nuit - Les contes d'Hoffman (Free)
Two opérettes by J.Offenbach: Pépito (Paying)and "Une demoiselle en loterie". I couln not find the last one anywhere
PACHELBEL JOHANN

Canon (Free) on Mfiles or Sheetmusicusa
Canon Transcription for Piano Solo

POULENC FRANCIS
"Nous voulons une petite soeur" I found the paroles , the score can be bought from Editions Salabert
PROKOFIEV SERGE
Romeo et Juliette  No free partitions  but I found it on Sheetmusicplus
PUCCINI GIOCAMO
PURCELL HENRY
RACHMANINOFF

Concerto N°2 Sheetmusic archives (Free)
Mouvement N° 3 the concerto N° 2 (Free)
To be bought on line from Sheet Musicplus
RACHMANINOV Piano Concerto No. 2 in C minor, op. 18 - DELUXE REMASTERED
EDITION For Piano. Classical (orchestral). Includes a printed music score on high-quality ivory paper; and a digital stereo compact disc, voluminously indexed for your convenience, containing a complete version with soloist;
then a second performance of the orchestral accompaniment, minus you, the soloist. Published by Music Minus One. (MMO-CD-3007)
Rhaposy on a theme by Paganini opus 43 (Free)
Prélude N°3 Opus 23 (Free)
Prelude n° 10 (Free)
Prelude N° 12 Opus 32 by Rachmaninoff (Free) pdf
Prelude en G Minor Opus 23 n°5 Rachmaninoff (Free) pdf
Variation on a theme by Corelli (Free)
Russian rhapsody for 2 pianos (Free)
Etude Tableau N° 8 opus 33
Sheet Music Plus.  
Etudes Tableaux, Op. 39 Piano Solo. (Free)
Etudes Tableaux, Op. 33 Piano Solo(Free)

RAVEL MAURICE
Ma Mère l'Oye Ravel (Click on Ravel in the Instrumental Music Composer List) (Free)
version pour piano à quatre main, Ravel To buy on line from Alapage (Paying)
Tombeau de couperin (Free)
A la manière de Borodine (Free)
REINHOLD HUGO
Impromptu Opus 28 N° 3 To be ordered on line at Stagepace.com
RIMSKY-KORSAKOV
Flight of the Bumble Bee  (Free) arranged for 2 violins, viola and cello by Andreas Daams
RUBINSTEIN
Melody In F, Op. 3, No. 1 
Sheet Music Plus
Keyboard . Level: Early Advanced (6+). Published by Alfred Publishing . (3603)
SATIE ERIK

Gymnopedie No. 1, piano  and Gnossienne No. 1, piano 
Mfiles (Free)
Gymnopédie N°2 and Gymnopédie N°3  
Mutopia (Free)
Gnossienne 1 to 5 and Gymnopédies 1 to 3 Free Pdf on Mutopia (Free)
Je te veux (Free)
Parade (Free)

SCARLATTI
SCHOSTAKOVICH
Waltz Nr 2 (from Eyes Wide Shut) for a C-instrument and piano
Editions Composer/Author Schostakowitsch, Dmitri Title Walzer Nr. 2 aus der Suite Nr. 2 für Jazz-Orchester Subtitle Für Klavier Arranger Kula, Richard Orchestration/Voice Klav Page number 5 Format 29,7 x 21,0 cm Edition number SIK 2300 ISMN M-003-02847-7 Price 6.90 
to be bought on line at Sikorski ou sheetmusicplus
SCHUBERT

An die Donau (Free)
ErlKönig Schubert
Herbst (Paying)
Piano Trio N°2 opus 100 (Free)
Sonate en La majeur D.959/scherzo-allegro
Landler (Free) on sheetmusicUSA or on Musica Viva
Ave Maria ( Free) or Sheetmusicarchives
Ave Maria for guitar (Paying) Musicroom.com
Stabat Mater .I could not find it free.This site tells all about StabatMater across ages.
Auf der Wassem zu singen F.Schubert (Free) pdf
Moments musicaux Opus 94 n°5 Schubert pdf (Free)
Der Hirt auf dem Felsen op. 129, D.965" (Free )

SCHUMANN CLARA
Scherzo from Opus 10  Commande en ligne à  Piano Pal
SCHUMANN ROBERT
Dedication (Widmung) de Robert Schumann, piano solo
Arranged by Franz Liszt. Piano Solo (Intermediate to advanced piano arrangements with no lyrics). Size 9x12 inches. 12 pages. Published by G Schirmer, Inc. (50501820) à 3$ 95 sur Sheetmusicplus.com
or on Recordare on line store with a sample of the first page free
Scènes de la forêt  (Paying) on di-arezzo.
SCRIABIN ALEXANDER

Vers La Flamme Op.72 (Free)
Nocturne pour la main Gauche (Free)
Nocturne for the Left Hand Piano Solo.

SIBELIUS JEAN

Suite mignonne pour Piano seul
Suite mignonne pour deux flutes et Piano
This research has a story. I visited many finnish and nordic sites.I finally found it on this adress
Here is the answer of a danish publisher about this work :
"Sibelius' Suite Mignonne is original for 2 flutes and strings orchestra. I don't know the work, but suppose that the flutes may have some solo role,and hence a version for flute(s) and piano has been made, there is nothingmentioned about a such version in the works list. But Sibelius himself arranged the work for solo piano.
Suite Mignonne was published by Chappell & Co. in 1921, so I suppose you will be able to find it through your local Warner/Chappell representation.
Another possibility is that Breitkopf & Härtel has reached this in their Sibelius Gesamtausgabe, I don't know. 
Professor at the Academy of Sibelius, Fabian Dahlström made a complete worklist, "The Works of Jean Sibelius", published by Sibelius-Samfundet
(Sibelius Society) in Helsinki, printed in Turku, Finland 1987. I don't know how to get it, but you could try the Finnish Music Information Center, see
www.fimic.fi for further information."

Trio pour cordes en sol mineur (Paying)

SILVANSKI  NICHOLAI
Petit Concerto. 
To be ordered from
G. Schirmer, Inc. and Associated Music Publishers, Inc.

Silvanski 50008540
Petit Concerto (Russian Soviet Library) AMP7712 $4.95
SMETANA 
SZYMANOWSKI  KARL
TCHAIKOWSKY 
Doumka by P. I. Tchaikovsky (1840-1893) (Gratuit) sur Mutopia
Symphony No. 6 in B Minor, Op. 74 "Pathétique" Tchaikovsky (Free)
Automne by Tchaikovsky (Free)
Francesca da Rimini, Symphonic Fantasia after Dante, Op. 32 Part I and Part II (Free)
Dance of the flowers Tchaikoskovsky (Free)
Theme from Swann lake ( Free)
The crown of roses by Tchaikovsky (Free) pdf
Dance of the Sugar Plum Fairy Tchaikovsky (Free) pdf
VAN HAL JAN KRTITEL
Sonatas for Viola and Harpsichord  
Op. 5 in C major No. 4, in D major, No. 2, in F major, No. 3, in C major,No. 1, Sonata in E flat major for Viola and Piano
Karel Spelina - viola, Josef Hala - harpsichord, piano, Vladan Koci - cello
I could not find them. The expert from Cantusmusic.com told me that they seemed to be out of print.A recording of the sonatas can be bought on Musica Bona,  specialized in czech classical music
VERDI
Va pensiro - Nabucco (Free)
VIVALDI

Nisi Dominus Sheet Music Plus
Nisi Dominus Vo Sc Lt/Eng Canto/Pf By Antonio Vivaldi. Choral Large Works.
Size 8x10.5 inches. 39 pages. Published by Ricordi - Italy. (50022660)
Domine Deus by Vivaldi (Free )
Quatre saisons sur CCARH publications
Free extracts from Music scores
My Sheetmusic.com
8notes