Just when you think Coachella can't be any more eclectic this year, Prince has been added as the headliner for the festival's Saturday night.  So we've got Jack Johnson headlining on Friday, then Prince the next night, and Roger Waters closing it out on Sunday night. Now that triumvirate is what one could liken to an odd Joe Franklin panel.  Coachella begins on April 25. There are 120-plus artists. Here they are.