Given his ubiquity, you’re probably a Joshua Radin fan without realizing it. The folk singer-songwriter has contributed dozens of songs to the soundtracks of TV shows and movies from Grey’s Anatomy and Dear John to various Zach Braff productions, including Scrubs and The Last Kiss. There’s a reason such dramas work with Radin’s music: The artist is known for his emotive lyrics and whispery vocals, each song a love letter left in the open that you can’t help but read. And it doesn’t get much more romantic than this: Radin wrote his latest album, Onward and Sideways, to woo a woman he met on vacation in Sweden. Tuesday’s intimate, acoustic concert at the Birchmere will highlight Radin’s raw, guitar-driven sound, as well as the techniques of his guest star, indie rock crooner Anya Marina. In line with his reputation for soul-baring, Radin might burst into impromptu covers from influences like Bob Dylan and Tom Petty. Joshua Radin performs with Anya Marie Tuesday and Wednesday at 7:30 p.m. at the Birchmere, 3701 Mount Vernon Ave., Alexandria. $35. (703) 549-7500. birchmere.com.