Yes, we are a rock 'n' roll dance group, but some of our members are experienced ballroom dancers who like to Cha-cha. That inevitably results in demands for some music they can Cha-cha to, which inevitably results in some 'cross pollenation' whereby our rock 'n' roll students learn some of that style.
That's a great thing which I encourage, as it makes them better dancers all around. In fact, in our warm up session, I lead the class through some basic latin-type steps. In the picture shown, Keith leads Natasha in a Cha-cha 'chase'.
A lot of music is suitable for either a breezy rock 'n' roll, or a Cha-cha. With a bit of practice, you can mix the two styles together.