(*Updated November 3, 2009.)
I made Twitter list here.
As everyone knows, Twitter’s people search was non-existent until just recently, and is mediocre even now. Given that, I compiled a VERY SHORT LIST (NOT THE TRADEMARKED KIND) of musicians who Twitter.
I have tried following most of them, and I’ll be honest with you: the majority of them are very, very, very bad at Twittering. I had to quit them. I’m sorry. Shaq is the least musician among them, but perhaps the second-best Twitterer (Jonathan Coulton is easily the best), in a fucked-up zen sort of way.
(If you would rather just follow people who are smart and/or hilarious, go here and scroll to the bottom.) Lil Wayne and Chris Brown and some others did some Twittering for the VMAs a couple years ago and were awful, then quit, so I didn’t include them. Also, I cannot guarantee the authenticity of all of these accounts. There are a lot of fakesters out there, and it’s not difficult to impersonate inanity.
(Also, of course, you can always follow a REAL HUMAN BEING. Just saying.)
Another list here, from Mashable.
Band of Horses
Hot Hot Heat
Mates of State
Questo of the Roots
Also: you may visit this ever-expanding spreadsheet for new Twitter musicians.
Here are some other guides to Musicians on Twitter: