Jason Mraz, a reggae-pop singer from Mechanicsville, Va. (Dave Matthews country, naturally), has been on a major label most of this decade, but it wasn’t until last year that he jumped up from just below the pop radar. You couldn’t avoid his ubiquitous hit “I’m Yours” as 2008 ended. Even if he doesn’t chart another hit like that, he’s got plenty of time to coast. Tonight, Saturday, July 25 at Merriweather Post Pavilion, 10475 Little Patuxent Parkway, Columbia, Md. Doors at 5:30 p.m. Tickets are $35 to $45. Call 800-551-SEAT or visit www.ticketmaster.com.