Gelling Flash at Concert

Has anyone ever tried gelling there on camera flash, so that it does not give the over flash powering look to your photos?

Gelling the flash matches the color temperature of the flash to that of the ambient (Tungsten in this case).
However, it does nothing about the flash output. Use Flash Exposure Compensation for that.

Search for some threads on (Night) Club photography, both here and in the "People" section. Lot's of info there.

ive actually been planning on trying this sometime soon at a show. im going to put a CTO gel over the flash and then shift the white balance to tungsten. this will give the ambient light in the room a really cool temp... and then the gelled flash should be close to neutral.

It gives a nice fill if you happen to match it with the current stage lighting, and if the stage lighting and flash combined don't give you blown highlights or wash out your exposure. I prefer using no flash at all, and just working at the lowest f/# your lens is capable of.

you can do special fx gelling too with gigs, if you're allowed to use flash. Just attach your fav colours or stuff that works with the current colour scheme.