Christian rockers who believe in musical evolution, Sent by Ravens make the kind of art-rock that comes from many hours spent studying the masters. On this year's full-length release Our Graceful Words, the South Carolina group combines quizzical guitar licks, brutal sprung rhythms and Zach Riner's angst-ridden howl for a guided tour of various post-punk, post-hardcore styles. They pull if off with panache -- the strange, sour slide guitar that opens "Jill Plays Tricks, Jack Plays God" catches you short every time, while the odd time signatures provide an objective correlative to their inner turmoil. It can get a little wearing, both musically and verbally -- like country music, Christian rock is meant for true believers. It almost doesn't matter: If you dig saviors who aren't shy about dramatizing their moments of doubt and pain, you'll get off on this collection of hot, tricky tropes.