Broken beat, drum & bass, nu-jazz, and no instruments-what? Bauchklang, a six-member Austrian acappella ensemble, has turned heads and freaked minds throughout Europe with its gifted display of vocal acrobatics. Many People finds the group continuing to meticulously build on the complexity of its well-received debut. Many People could have easily fallen into the novelty section, but Bauchklang commands attention; “Good You Do” is a catchy head-nodder with bassline, beats, melodies, and chorus, but nary an instrument in earshot. For a truly wicked vocal workout, the drum-and-bass fervor of “Navigator” must be heard to be believed. Eat your heart out, Bobby McFerrin.