David Wax Museum plays a dynamic hybrid of Mexican and American folk. It’s an energetic and infectious blend of crisp rhythms, organ, horns, drums, and traditional Mexican instruments. Knock Knock Get Up, the group's third release, has the same joyous feel as its previous two, yet with more adventurous arrangements and textures. Here the band injects primitive percussion, fuzzy electric guitars, and scattered field recordings that add depth and mystery to its sound. There are also Caribbean and Brazilian influences in places. David Wax and Sue Slezak form the core of the band, and they're joined by multi-instrumentalist Greg Glassman. Wax is an engaging singer, and he and Slezak harmonize superbly throughout. The band is agile, tight, and unpredictable. “Wondrous Love” is an ethereal ballad sung beautifully by Slezak. “A Dog in this Fight” is stark and taut, and “The Rumors Are True” is elaborate chamber pop. The David Wax Museum has crafted and claimed a rich sound all its own.