I love the challenge of trying to do both, and I think it does add variety if they don't know who's gonna sing next!
I sing lead on 5 or 6 songs at a gig, but I'm not sure I'd like the responsibility for the whole night though.
The one thing I'm not too great at multi tasking on is the movin' and groovin' while I'm playing. If I move about too much I lose it! .. and yet I love dancing!
