1. You can put any song to any stage you want. My game had almost none of the actual songs that went with the stages. I like it better that way, and as I have expanded it, I almost never use any music that comes with the stages. Most of the time, the music is really lame and girly and not for me.
2. Theres tons of original stages in the stages sections. You can stroll through the low res or high res sections, or check out the stages collections. Dont ask people to find stages for you, when 8 out of 10 times your probably going to reject them anyway. You know what you want, go find them dude, youll find more good stuff searching yourself. Dont limit yourself.