welll…… my ACTUAL break is at B or maybe C, above which it is pretty much impossible to sing in chest. But at F, it becomes increasingly comfortable to throw the note up into my head so I always have to decide which to use. After F, I can no longer sing in chest voice quietly–can only belt. So…. I guess the choice is usually based on how loud I want it to be. Or if it needs to be held out long (pretty sure the last note of the psychic was F also; I sang that in head)