How sign-language interpreters handle Lady Gaga
washingtonpost.com
washingtonpost.com
Or is it the other way around, that since deaf people have a full language available using (intricate) gestures, they don't "need" (and therefore never learn) the more generic gestures used by hearing?
If they didn't interpret the gestures, they'd fall out of the stream and be harder to understand. For example, if a professor says "You can see here [points at figure A on the board] that ABC and here [points at figure B] that XYZ..." you need to have those "points" in the right places to understand them.
Certainly not all gestures a musician makes are significant, but some probably are.