I love Ghost - saw them open for Mastodon and Opeth. I'd heard of them but not actually heard their music. Looked them up on Wikipedia during the show and saw a notation that said they were a Satanic band, looked up at them, looked down at the entry again and said, "Really? Do people take this seriously?" Unfortunately missed them last time, but I need to see them again.
Saw Ghost live a little while ago. They definitely play the songs heavier live. Surreal experience. Heavy sound, pop hooks, satanic theme, but the band is obviously "in on the joke". I'd definitely see them again and take a friend for the fun of it.