H00D

At the end of the composer mission it black screens and still plays music, but it doesn't go to the next scene. This is my 4th time doing this, and this time I'm on legendary, so I hope somebody can tell me what I can do to get to the next mission (without having to revert to save, which then sends to the next mission, but it says I didn't complete Composer). And my disc is not scratched whatsoever.