HEY, YOU: KYOU Radio (legally KYCY at 1550 AM), with its mix of podcasts and financial advice shows, may not have many listeners (the Oakland A's broadcasts will help), but it's got its believers -- especially radio pros and musicians getting a chance at a regular show. One of them is Jon Hammond, on most weekdays at 3 p.m. "The old-time spirit lives on AM again," says Hammond, an organist