There is one class I go to which uses a lot of the typical Zumba-type music which is very Spanish and we tend to do a lot of salsa moves. Whereas there is another one I do which uses current songs so we bop around to Usher, Beyonce, Olly Murs, Pitball as well as classics like Tina Turner! And there are always new routines coming out.
If you're someone who struggles to motivate yourself to get on a treadmill I would highly recommend Zumba. It's fun, sociable and you can really work up a sweat. I tend to really go for it and make the most of the hour so I'm dripping my the end of it! But you can work to your own fitness level.
My only concern with it is that sometimes my knees feel a little bit sore afterwards. But I have bad knees anyway. I was recommended to use glucosamine gel on them and that helps so so much. If any of you get muscle twinges on the knees, ankles, elbows, fingers, wrist, anywhere really this gel sinks in fast and gets to the cause of your discomfort really quickly.