Okay, here's my 2 cents. I've always seen 45s as singles. I used to be under the impression that all 12" records played at 33 rpm. There's a lot of 7" records that play at 33. Now to add some more confusion: The latest self-titled Modest Mouse 12" plays at 45. On a different note: Does anyone know if anyone has been confirmed for playing Halifax On Music? Just wondering.