Sound representation is the most low -level representation from these three. For sound representation spectrograms and waveforms are used.

San Diego State University

1. Score Representation
2. Performance Control Representation
3. Sound Representation

Different Representations of Music

Here we mean high-level representation of the music, more specifically, lead sheet, chord chart and so on. 

Here each note is encoded by its pitch, dynamics. As a performance control representation, MIDI piano roll is frequently used.
