Folk-rock collective Dirty Bird has a new, lovely single out called “Once,” and they are celebrating it in style April 21 at the Mercury Lounge. The single contains strong male-female harmonies, a catchy lead melody and the band’s signature creative approach to Americana. The group seems to have improved the formula from their 2018 record Still To Be Ours, pushing their experimentation farther without betraying their own sound. This is a band that deserves to be seen live and will be supported by fellow folk-rock group Dead Gowns from Portland, Maine. Check out Dirty Bird’s new single below. – Rene Cobar