I followed a link from Warren Ellis's Twitter feed to this posting about a half-day MP3: "Frolic in Brine, Goblins Be Thing" by Aairria. The idea of a work of audio art (I hesitate to call this "music" but I suppose it meets the definition) consisting of twelve hours of background noise appealed to me. But I didn't really want to spend the time it would take to download that (probably more than real time, because the MP3 is high-fidelity) on my slow home network connection and then make a block of time to listen to it, and I was also a bit disappointed to find out that the actual title is "Frolic in Brine, Goblins Be Thine" (a reference to the Ring movies), which I think is much less interesting than the typo.
The same artist has a bunch of other work online. I downloaded Sleepwalking and listened to it during one of my Sunday-morning urban hikes. It's about 65 minutes of basically just a humming noise. On the one hand, I definely got something out of it. There's more going on here artistically than one might expect from the description "65 minutes of humming." On the other hand, by the end of it I felt disappointed. I thought that it didn't live up to its possibilities. So the next step is, can I do better?
I got Csound and played with it for a while, and have posted the first of my results to a new account on SoundCloud. Below the cut (because I don't want to put external-site iframes on my front page) are embedded Flash players.