To call the music of the David Wax Museum spirited is all at once the truth, but also a bit of an understatement. Since forming in 2009 this band, which at its core is the duo of David Wax and Suz Slezak, has maintained a fierce independent personality and relied on a grassroots approach to spreading their music. They’ve blossomed thanks to their passionate live shows and now their latest album, Knock Knock Get Up, is matching that excitement.