“Music about music” is a bad idea.
It reduces music to a zombie, kept alive by math.
This is what happens when musicians get so caught up in their techniques and and tools and music theory that they forget music is a symbolic art form. Music should mean something.
The counter-argument is, “Music is subjective and it can mean whatever you want it to mean.” A popular cop-out for musicians who haven’t learned how to create conceptually.
Here are some meanings that music can convey: Anger, beauty, confusion, disaster, power, humor, suspense, fear, adventure, pride, defeat, pain, loneliness, love.
Much more interesting than “five” or “fast.”
And harder to do!