If your instructor is new to Body Combat then he/she will only have 1 CD until he passes his final certificate. (3 months) After this they will be allowed to teach the next release. As other people have said on here, when you have  a few CDs behind you you can vary the music more. I  always teach the new one for 4 weeks then I mix every 2 -3 weeks after that. Some indtructors do more and some less. I could not teach the same one for 3 whole months!!! ( I did in the beginning because i had no choice)

I love this release but I can see where you are coming from for a couple of tracks. i personally dislike the music for T3  (speedballs etc)  and T4 for the choreography. Having said that, it's a tough workout when you work through the levels.

Maybe your instructor is still learning the best way to teach it. Give it some time. Bad luck about your other class, if you really love something then it's hard to give it up especially when it wasn't you choice.