I recall being in my car with WKCR on the radio, and they were having the 'Noise Fest'. Some of the things played were recordings of various power tools, scraping, etc. To my ear, it was music, even though it was harsh, very likely random, possibly bereft of artistic intent(at least on the part of the noisemaker), etc. Two people walking in heels(insert jokes here) can be music, and I find that sometimes the NYC subway trains make music to my ears. There's no artistic intent and nobody organizing the sound, but it's still music. Perhaps music is whatever a listener thinks it is, but the Ives example referred to earlier has no one listening to anything but there's still music there. I tend to go along with what Jim Sangrey posted earlier about defining what music isn't, then we can proceed.