I bought this CD and I knew about it before hand on the radio. I, at first, thought that it was the B-52's singing but to my surprise, it was R.E.M. at the helm. The song is very simple, anyone can learn the song in one sitting. It's all about happy people and having a good time and enjoying life. The song plays at a danceable beat and it repeats itself several times then it goes slow like it is about to end. Then it starts up very slow, like they ran out of breath. Then, the lead singer, Michael Stipe, sings, "Here we go...", which is my favorite part of the song. It's like, he's saying to the listener if you haven't joined in all the fun, here is your chance now. Then the music changes and Michael Stipe and one of the singers from the B52's, Kate Peirson, sings the chorus. I can't help but sing along and be happy if I'm not already in the mood. It's a great "picker-upper" when you're down in the dumps.Kudos to the infinate power!