I’ve heard a lot of nice things about Triangle Yoga in Chapel Hill, North Carolina. It’s a bit out of the Washington, DC area, but I know of two instructors who took intensive classes there. I ran across this interesting demonstration of combining music and vinyasa on YouTube, while wasting time during lunch.
Rhythmic yoga flow does require a command of the asanas and breath that most beginners don’t have. I’m not even sure that I could get it at first try.