The Yamaha bt 01 needs a compatible app to be recognized by the iPad. Seems that bandhelper and setlist maker are such compatible apps, forScore up to now is not. So with forScore you will need a second app. But that takes only 10 seconds and if you use midi wrench you get a midi monitor and you can see what happens in the land of midi.
So there are lots of possibilities and you can search for the perfect solution.
I can highly recommend forScore. Works perfect for me.