What elements does "organized sound" need to be considered "music"?
That is very subjective like most things in the art world are. Steve Reich and Phillip Glass, Ligeti belong to the 'modernist movement' much more experimental and radical often with tumultuous tempo changes and awkward meters. 'Organised' sound may not fit so well for atonal music despite it often being very meticulously planned.
The only necessary condition is that something be perceived as music. Not even sound is necessary, as even silence has been officially sanctioned as music, as in the case of John Cage's 4'33": https://www.youtube.com/
As Ron Swanson from Parks and Recreation says: https://www.youtube.com/