This is one of the most awesome things to ever happen in Second Life that I'm aware of - and it's happening reeeal soon, AND it's free.
Phil Hartnoll (of Orbital fame) and Nick Smith have come together to create a group called Long Range - a must see/must hear.
See it for real in the UK, or attend virtually, for FREE, here!
http://www.longrangeinsecondlife.com/
Here's what their music sounds like - even if you are not into electronica, it is incredibly accessible and enjoyable (as I'm told by my non-electronica-awed friends - I'm deep into it myself).
Listen here, 1 click away: http://www.longrange.tv/music
Lastly - some of the incredible preparations going into this, done by some of the most wonderful, offbeat people in SL that I know of...
http://davancamus.hexaflexagon.com/blog/
Just... wow!