No you're simply wrong. This is how a "classical Western" musician thinks of music, but this is not necessarily what music is. Timbre is the main expressive content in many cultures.
Check my comment here: https://news.ycombinator.com/threads?id=gnulinux#42368137
Maybe there is a difference how formally trained musicians and computer scientists see it. But actually I don't see a contradition of your statement to what I've written.
And don't forget that also Miller Puckette comes from the Western musical tradition and developed important works at IRCAM.