Powder, this stuff is GREAT!
I agree with everyone else who enjoyed "Approaching Danger," I've always thought that was one of Shredder's better themes.
As for requests, I'd like to see Krang's theme done, you hear quite a bit of it in "Enter the Shredder" when Krang is introduced. You also get a really good listen to the very first part of that music at the end of season 3's premiere "Beneath these Streets" at the end of the episode when Krang confronts Shredder on his most recent failure.
I'll try to think of some more, but until then keep up the radical work, dude!