When i go to the end there usually always music playing with hardcore ender expansion. lately there has been a 50 - 50 chance of there being music. I usually have to log out and back in the world 2 or 3 times before it plays music again. When it does play music, it isn't as common as the music in minecraft 1.6.4. This may only be for my computer, I honestly don't know

It takes a little longer to kick in, and you need to have the dragon loaded.

i honestly don't think it's suppost to take a half an hour to load. Had a watch to time it

oops just found out i just had a slow tick rate at the time.