First there was the sound of the instrument, and it was thought that is all there was to music.
Then songs were composed and the song became a part of music.
Then songs became segments of larger works and these compositions became a part of music.
Then the musicians (and conductors) gave music their own interpretation and the performances they made became a part of music.
Then the studio was invented and now the treatment of the instrument and how music was produced and recorded became a part of music.