I'm listening to Blue Oyster Cult right now, most any of their songs are perfect for the happy, lucid mood I'm in.
I only really listen to music when I'm happy, which I'm lucky to say is the vast majority of the time. I listen to almost anything when I'm happy, from Megadeth to Jethro Tull. Just depends on what I'm feeling like at the time.
When I'm anything but happy, I'm too busy working towards getting back to happy ^_^