The music at the Joe is standard popular tunes from the last 70 years. R&B, Rock, 80's, hip-hop, whatever. The new stuff is also top-40, not that hard to find.
Newer pop is heavily influenced by rap and the EDM movement. Detroit was a major founder of electronic dance in the 1980's. There's always been an underground, artistic nature at the source. It's about the spirit, the experience, and dancing. These DJ's are ultra talented, able to use songs for their own performance. EDM has taken over modern music, I like the direction it's evolved. If you're interested check out this party, great example of the roots and current scene: