The Pianoforce Performer player piano system is a MIDI equipped music playback and record system (with record option) for acoustic pianos. MIDI is an acronym for Musical Instrument Digital Interface. It is a universal language adopted by the musical instrument manufacturers so various MIDI equipped devices can talk to each other. MIDI is a form of communication. The Performance system has two main parts, the Stationary Controller (the central brain) and the solenoid rail (or engine). Notes or keys C1 to A8 on the piano have a corresponding solenoid. The Performance system performs the MIDI messages sent from either the internal CD-ROM, Internal Library or external USB device. A message received by the Performance prompts the key solenoid to rise, hitting the tail of the piano key. The associated hammer then strikes the string exactly duplicating manual playing.