Choir introduces the Friedbergs' grandmother, Olga Sarantos, who delivers a spoken-word memoir backed by a wall of arcade-game synthesizers, haunting piano themes, and a couple of fuzzed-out guitar solos. Absent are songs and lyrics; instead, we get Olga and Eleanor talking about life in 1940s Chicago, while Matthew noodles on the piano or simulates the sound of a siren for 30 seconds. Despite its baffling nature, though, Rehearsing My Choir is compelling listening, with hundreds of riffs, lines, and musical ideas stitched together as musical sketchbooks, full of half-ideas and orphaned melodies that succeed as often as they fail.