Shelley - it's pretty obvious that you're working on some classwork but all of this definitely has the feel of doing someone's homework. I don't mind helping you out or giving advice but you need to give us some of your own ideas. It's a lot easier to give you tips to make a lesson plan better or tell you were so problems might lie.
As far as using music in the classroom, here's a podcast you can download and listen to on-line or off-line with some lesson plan ideas and games.
http://www.eslteachertalk.com/2006/0...the-classroom/
Here's a thread here on activities for large classes:
Does anyone know some good activities for large classes?
I hope those help.