Ah, the type of photography I enjoy the most. When photographing music events it's best to know the music already. You can prepare by listening to the groups before hand, get to know the songs. Even better is to watch a live YouTube video that way you can get to know their set and know when they are going to play the hits or when they are going to do those jumps and go into the crowd.
Message the band, always good to build up a relationship with them. Up and coming bands are always looking for photos. You will have to offer your service for a low rate or even free but with a band getting bigger they could use you again. Exposure is a good thing.
Group shots are great, you get to meet the band, talk to them learn what type of style they want. No more in the woods photos thank you. You can learn different poses from looking at other images from magazines and on line. Do something different than what you've seen just make sure everyone's in the shot. Experiment with lighting too, anything that makes the image stand out.