It depends on the music. I highly recommend Night Club Two Step for the slower songs, and rumba frequently works. There is virtually nothing that's not danceable. We frequently dance ballroom/Latin (including waltz, foxtrot, rumba, cha-cha-cha) to Pink Floyd. Argentine Tango is also famously adaptable and can be danced to virtually anything. For example, we don't really like Viennese Waltz, so you will see us dancing tango vals instead. For a real treat, try dancing to some music in 5/4 or 7/4 time.