When T.S. Eliot wrote, “Mankind cannot bear much reality,” he inadvertently (“post-rock” hadn’t reached Oxford yet) described Montreal-based Godspeed You! Black Emperor’s bombastic sound. The band’s music is classically structured and is often lumped into a genre called “post-rock,” though the band dismisses this as a pretentious term. “Post-rock” is used to describe instrumental groups that include the traditional rock n’ roll instrumentation -- guitar, drums, bass -- but breaks from pop song structures. Instead, post-rock draws from a diverse array of influences, most evidently jazz and classical music. The detached, introspective sound of many “post-rock” bands is nonexistent in Godspeed’s music.