Prefuse 73 is the brainy glitch-hop alias of producer Scott Herren; School of Seven Bells are a new band featuring members of Secret Machines and On!Air!Library! Their soft-drug collage rock is a kaleidoscope of gorgeous female vocals, electronic grooves, stargazing guitars, steady rhythms, and warm colors. The band's synesthesia is all organic; Prefuse 73's is brilliantly digital, a busy mix of sharp beats and surround-sound samples. (Neumo's, 925 E Pike St, 709-9467. 8 pm, $13, 21+.)