Broadway is bad wonder if you are heading for Cultural Victory. It increases Great Musician treshold without serious payback (little tourism blast). You should also aim to pop your first musician just after Internet (which is easy with Oxford). Combined with 4 musicians from faith. If it is not enough, you will have to accumulate 300 points of GM instead 200, which is time waste. I had this scenario yesterday (GE for Eiffel, so I have time to make Broadway...) and of course I had to wait for third GM (22 civs, 12 still alive, 5 civs with decent culture).