The Death Note Musical is an interesting take on the series. You can find the Japanese performance floating around youtube in clips (there used to be a full video, but I've been unable to find it), the English songs recordings can be found here. An interesting extension of Light Yagami's beliefs on Justice. I much prefer the Japanese lyrics, but the English is good as well. I'm not too fond of musicals, but this was an intersting watch. I enjoyed L's actor.