NORMAN — Summer's not quite here, but the time's already right for dancing in the street, since the first Norman Music Festival will be heating up things along three blocks of Main on Saturday with some of the hottest alt-rock bands in the business.

Ex- Tripping Daisy leader Tom Delaughter 's heavenly 25-member, robe-draped pop choir, The Polyphonic Spree , will headline a free 12-hour event that includes such...