Husband-wife duo O.B. Howard make acoustic folk that’s sincere but not corny, lovely without feeling sticky. Alexandra St. Thomas handles guitars and most of the lead vocal duties, with Buck St. Thomas on banjo and harmony. Their debut album is spare enough that each additional element – a church organ here, an echo effect there – has maximum impact. They’re playing a free show on Main Street in Warren at the Galactic Theatre, a venue that’s gone from vintage store to movie theater to acoustic music venue. seatbelt and How’s About Charlie are also performing.