In 1987, the Pet Shop Boys got a UK #1 with "It's A Sin," which, despite plenty of competition, might be pop music's definitive Catholic-guilt anthem. Over itchy disco percussion and choral drones, Neil Tennant deadpans, "In school, they taught me how to be / So pure in thought and word and deed / They didn't quite succeed / For everything I want to do / No matter when or where or who / Has one thing in common, too." Neil Tennant wouldn't come out publicly until seven years after "It's A Sin," but the song, which also went top-10 in the US, practically spelled things out for us. It gives us the worldview of a gay man who, no matter how far he goes in the world, has a sense of shame baked deep into his soul. It's a feeling he can't escape.