here is a definition of music derived from freedictionary.com/music:
"the art of arranging sounds in time so as to produce a conhtinuous, unified, and evocative composition, as through melody, harmony, rhythm and timbre".
note its sound in time not sound in place that is part of the definition. the location of the music is not part of the definition, so depth and width are artifacts. they constitute perspective when listening to music, they are not included in the definition of music.