The booming “Be My Baby” beat that opens Psychocandy, The Jesus and Mary Chain's 1985 debut, wasn't just an echo of rock's past—it was a warning shot announcing its future. The collision of Jim Reid's eternally dazed voice and brother William's murderous guitar feedback was the big-bang effect that gave rise to indie rock, shoegaze, and grunge. But even as they turned down the amps, the brothers never lost their cool: Whether it's the electro-powered pop of 1989's “Head On” or the countrified longing of 1994's “Sometimes Always,” they remain the go-to soundtrack for wearing sunglasses indoors.