electronically, optically and/or magnetically pre-recorded musical data on compact disks, cassette tapes and/or microchips for use in player pianos; player piano conversion kits comprising mechanical units for operating and/or being operated by the piano keys and electronic controllers for converting pianos into player pianos; musical data readers and recorders for operating and/or recording the operation of player pianos and digitally operated musical instruments; and analog-to-digital and d...