Eric Jayne has put together a list of his top 30 atheist songs. It seems like it ought to be longer — to my mind, if it isn't praising Jesus or any other supernatural entity, it's an atheist song…which means just about every decent piece of music there is. (That is not to say, of course, that there aren't any good religious songs — I've got a small collection of gospel music on my iPod that's pretty darned lively).
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One of my favourite 70s songs, below the fold: "Life's a Long Song", by Jethro Tull, from the 1971 EP of the same name. For some reason the final episode of Battlestar Galacticaput this in my head.