For a really strong standard rep, you'll probably need these:Albeniz Triana and probably a couple more movements of Iberia SuiteBach A couple French/English SuitesBach 6+ Movements from WTKBach An overture and/or Chromatic Fantasia and FugueBartok 1+ of the following: Sonata SZ. 81, Two Rumanian Danses Op. 8a, Out of Doors Suite, Three Etudes Op. 18, suite Op. 14 Beethoven most of these sonatas: Pathetique, Moonlight, Tempest, Op. 49 No. 2, Waldstein, Appassionata, Les Adieux, Hammerklavier, Opp. 109/110/111, and Eroica VariationsBrahms at least three of the following: Paganini Variations, Handel Variations, Sonatas Opp. 1, 2 and 5, Fantasiestucke Op. 116 and Waltzes Op. 39, Klavierstucke 117/118/119Chopin Etudes Op. 10 and 25Chopin Various Balladen/Scherzi/Polonaises, from most important to least importantPROBABLY want the Preludes Op. 28 alsoChopin Sonata No. 2 and/or No. 3Debussy at least 3 Etudes and 6 Preludes; must have Feux d'Artifice, Bruyeres and/or Ce Qu'a vu le Vient d'OuestDebussy 2+ of the following: Estampes, Images I, Images II, Suite Bergamasque, Pour le PianoHaydn 2+ Sonatas; should include C Major and/or B minorLiszt good collection of Transcendental/Paganini/Concert Etudes, must have La CampanellaAny 6+ of the following: Sonata in B Minor, Apres un Lecture du Dante, Hungarian Rhapsodies 2/6/12/13, Spanish Rhapsody, Ballade No. 2, Tannhauser Overture, Reminiscences de Don Juan, Isolde's Liebestod, Polonaise No. 2, Mephisto Waltz No. 1, Liebestraume No. 3, large movements from Annees des Pelerinage/Harmonies Poetiques et ReligiouseMozart 3+ Sonatas; K330 and/or K533 and/or K576 should be oneAt least one set of Variations; K176 or K573 are my personal favoritesProkofiev two of: Sonata No. 2/3/4/6/7/8/toccataRachmaninov Sonata No. 2 (1931)Rachmaninov Nos. 1/2 from Cinc Morceux Op. 3Rachmaninov Large Selection of Preludes Opp. 23/32 and Etudes Opp. 33/391+ of these: Corelli Variations, Moments Musicaux, Humoreskes Op. 10, Polka de W.R., Mendelssohn Scherzo, Sonata No. 1Ravel Gaspard de la NuitTwo+ of the following: Sonatine, Miroirs, Valses Nobles et Sentimentales, Tombeau de Couperin, La ValseScarlatti at LEAST 5 Sonatas, including K141Schubert 1 or 2 sonatas, at least one should be: D850, D894, D958, D959, D960Possibly a set of Impromptus from Schubert alsoSchumann 3+ of the following: Waldszenen, Kinderszenen, Fantasy Pieces, Carnaval, Kreisleriana, Symphonic Etudes, Davidsbundlertanze, Sonata No. 1, Sonata No. 3Scriabin Strong set of preludes/etudes/mazurkas and/or Sonatas 4/5/7/9/10/Fantasy Op. 28/Vers la FlammeAnd there will always be pieces like Pictures at an Exhibition, Trois Mouvements from Petrouchka, Chaconne BWV1004 etc. that are semi-common but not mandatory.You're also going to want some modern repertoire. Here are some of the more common pieces (you'll want 2-3 of these pieces):Barber Sonata Op. 26Berg Sonata Op. 1Bowen ToccataCorigliano Etude FantasyDe Falla Fantasia BaeticaGinastera 3 Argentian DancesGinastera Sonata No. 1Hindemith Suite "1922"Ligeti 3+ EtudesMessiaen 1 or 2 Movements from Vignt RegardsNancarrow Tango?Rzewski North American Ballads Nos. 3/4Schoenberg 6 Little PiecesTchaikovsky-Pletnev Concert Suite from the Ballet "Nutcracker"Vine Sonata No. 1There are also other romantic or early 20th century composers you might look into like Alkan, Godowsky, Medtner, Busoni, Shostakovich, Franck etc. It would probably be a good idea to have at least one piece by one of those composers.For Chamber works, these are the most common, but among them none are like, more important to have, than the others. I would suggest having 2 Quartets and 2 Quintets at least:Beethoven QuartetBrahms Quartet Nos 1/2/3Mozart Quartets K. 478 and K. 493Schumann QuartetBartok QuintetBrahms QuintetDvorak QuintetFranck QuintetSchubert Trout QuintetSchumann QuintetShostakovich QuintetFor Concerti, you'll want a selection of Classical, Romantic and 20th Century, again, at least two of each. Here are the most common ones:Beethoven Concerti 1/2/3/4/5Bartok Concerti 1/2Chopin Concerti 1/2Gershwin ConcertoGrieg Concerto No. 1Liszt Concerti 1/2Mendelssohn Concerto No. 1Mozart Concerti 20/21/23/24/27Prokofiev Concerti 2/3/5Rachmaninov Concerti 2/3/Paganini VariationsRavel Concerti Gmaj/DmajSaint-Saens Concerti 2/4Hope this helps.