Occasionally they overlap a bit. You can hear hear tinges of gospel stuff in their rock songs. Of course, a quicker, pithier explanation is from Pinko Punko, in which he termed Spiritualized 'drug boy singing about drugs'. I can't honestly dispute that. The endless allusions to drug use and the effects thereof are unavoidable. But hey, music's gotta be about something. So here are the three phases of Spiritualized:
And that, in a nutshell, is Jason Pierce and his professional output. And it's pretty amazing live.