With her airy, plaintive voice as the through-line,Thornley manages to shape-shift over the course of her three independently released albums — her 2003 self-titled debut, 2006’s My Glass Eye, 2010’s Wash U Clean, and now her latest EP, Septagon (April 2014)— with music that spans ’60s-inspiredpsychedelic rock, to groove-minded dance tunes, to indie singer-songwriter pop.

Her range is so vast that music supervisors have been able to use her songs to underscore everything from the above-mentioned emotionally charged scene to deploying “Wash U Clean” in a playful sequence of Channing Tatum and Alex Pettyfer grinding up on some sorority girls in StevenSoderbergh’s Magic Mike. Her songs have also been featured in the movies AssBackwards, The Perfect Man, Between, and Play The Game, as well as the TV shows Friday Night Lights,Hung, Royal Pains, Vanderpump Rules,The Client List, Save Me, Ringer, Suburgatory, Jersey Shore, In Plain Sight, TheHills, Newport Harbor, Making the Band, Life, Jack and Bobby, Everwood, andScrubs.

In 2012 and 2013, Beth and the composer Rob Cairns (who has played guitar, bass, and drums on and supplied savvy production for all of her albums and three tracks on Septagon) co-wrote an original rock musical called Bad Apples, which earned the pair nominations for "Best Original Score" by the Los Angeles Drama Critics Circle, LA Weekly, and L.A. Stage Alliance, winning awards from the latter two.