I would stay away from CW. There are lots of listeners on this board which are not amateur radio operators and would not be proficient with CW.
RTTY is a nice touch and MMTTY, in my opinion, is a nice free lite decoder that works very well.
What I think might be a great way to deliver the song info would be to create a cue sheet with your station ID etc ... and SSTV the whole thing. Pretty much everyone here is familiar with SSTV and is used by many of the other pirates.
My 2 cents ...
~SIGINT~