Chvrches attracted last year was due to “The Mother We Share,” which the band had released online. It opens The Bones Of What You Believe and is the album’s leadoff single, with good reason: It’s one of the year’s best songs, propelled by overlapping synthesizers and a triumphant chorus that vocalist Lauren Mayberry carries higher with her lilting voice (made more charming because she doesn’t attempt to hide her accent). “The Mother We Share” attracted a lot of attention toward the end of 2012, but the band wisely kept it off March’s Recover EP and let it anchor the full-length. As good as “The Mother We Share” is, it wouldn’t be enough to carry the album, but Chvrches follows it with an even catchier song, “We Sink,” and another solid track, “Gun,” making for one of the strongest starts to any album this year.