Your Choice. Pick Chopin's Preludes, Nocturnes, Etudes, or Waltzes for Player Pianos Or Purchase ALL four at a substantial discount Choose Yamaha Disklavier PianoSoft SOLO floppy disk, PianoDIsc Floppy disk, Yamaha Disklavier CD, PianoDisc CD, USB MIDI, or USB E-seq PianoSoft Solo. The Yamaha Floppy Disk PianoSoft format is for Yamaha Disklavier, Clavinova, and PianoDisc Player Pianos and ships on a 2SDD disk, Most all other brands like Baldwin, Suzuki, Technics, Roland, Kurtzweil, Kohler, Kawai, Casio, Adagio, Artesia, and others will require the MIDI format on a 2SHD disk. If you order the MIDI disk and need it on a 2SDD type disk then you will need to contact us or leave a note. The Yamaha CD will only play on a Yamaha PianoForce, The PianoDisc CD will only play on a PianoDisc system, They will NOT work with any other brands like QRS, Baldwin, Etc. If you are not sure just write with your make and model and we will try to help.