“It sounds like I’m singing in the bathroom and you’re singing way over in the kitchen,” says Scott Townsend — better known as the drag queen and Cher impersonator Thirsty Burlington — to Mark Meehan. Meehan, a local musician, will be backing up Thirsty with vocals and piano for “One Night Only With Cher,” opening at the Crown & Anchor poolside on Memorial Day weekend and running through the summer.