An exploration of what is and is not a piece of music, like this work explicitly is, needs to acknowledge the possibility that the answer might be “no, this isn't”. Dictionary definitions are entirely irrelevent except insofar as they provide the inspiration to ask “wait, but is that _really_ all a work of music is?”

One of HN's few(?) music appreciation professors here: in fact, I start every term posing this question. It's hard to teach music appreciation before a group of humans can agree where music begins and ends :) At the end of the day, like everything else it's a certain degree of statistics and a certain degree of subjectivity.