i have a question about that. what if the artist sings just noises? how do you sign that? what if the interpreter is not familiar with the artist? I mean even if they had the words they dont know how the song goes. Just curious. Im seriously curious, not joking.
I went to school at RIT (Rochester Institute of Technology) and they had the National Technical Institute for the Deaf as part of the school. Every on campus concert had interpreters. I think they met with the bands earlier and went over setlist/lyrics. They do an amazing job keeping up (or at least it looks like they do to me). A lot of the bands are amused by this and at some point stop the show to make them sign-swear or sign something vulgar.
on the Pearl Jam Touring Band 2000 DVD, I believe it is, Eddie Vedder pulls a woman up on stage because he notices her signing the vocals to someone. It was actually pretty impressive to watch. Her hands moved sooooo fast. She kinda danced too, so that would probably really help the deaf person with the rhythm. I can't imagine signing a Pearl Jam show of all concerts. Some bands you know what they're going to play. A Pearl Jam show could end up being 3 hours of sign language and a whole bunch of rarities.