Hi Scott,
I have seen on TV many bands performing live and it looks like more and more of them (especially the drummers) are wearing headphones, I guess for monitoring purposes. In some cases they even use those models with a microphone included. I wonder how good the quality can be for singing...
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.