Live music fills the streets of downtown Tucson and Fourth Avenue as bands perform on about 25 different stages during Spring Club Crawl. The event is 21 and up.  Wristbands are $8 if purchased in advance at Zia Records and $10 at the door.  A tentative band lineup is available through the Tucson Weekly at clubcrawl.ning.com.  For more information, call 795-1420.