HornsUpPhotographer wrote in post #15413168
So close space with maybe neon lights or even DJ multicolor light set ups.
Can be challenging using any setup 
HornsUpPhotographer wrote in post #15413168
I have found recently when I was doing photographs for the family during xmas that the 18-55 had a hard time getting bright shots even with a high iso (T1 goes up to 3200) and flash. When I tossed on the 50mm I was able to get the ambient lighting and just the stock flash and even brought the iso down to 400 and got some great warm shots.
That was probably caused by something else.
The 18-55 has a widest aperture of f/3.5 at the wide end to f/5.6 at the long end.
Let's assume you were comparing at a bit under 50mm, so the aperture was approximately f/5.0. This is 3 stops slower then the 50/1.8 wide open.
So you shot the 18-55 at f/5; ISO 3200 and the 50mm at f/1.8; ISO 400.
ISO 400 to ISO 3200 is also 3 stops, so you should get identical exposure with both setups at the same shutter speed and flash power used (more noise in the ISO 3200 shot, less DoF in the 50mm/1.8 shot obviously).
The 18-55 might have a harder time focusing because less light get's in, but the 50/1.8 isn't exactly known for trouble free focusing either…
Fast lenses certainly have their uses, but for certain types of shots (group of people, where some DoF is needed and flash is used) the 18-55 should cope.
Example: Backstage shot of a "meet and greet":
http://www.damkot.com …ingBorder_0030_large.html
1D3 using 17-35L at 1/15 sec, f/6.3, ISO 3200 using bounced flash
I could have taken a similar shot (provided I'd be able to back up a bit to accommodate for the different field of view) using a T1 with kit lens.
The rest of the images in that gallery are of a festival in different parts of a venue, with quite varying lighting and a variety of focal lengths used (between 17 and 200mm, maybe occasionally with a 1.4x TC added).
Exif should be there, to give you an idea.
Keep in mind that my 1D3 has a bigger sensor, so your camera has a slightly narrower field of view. 
HornsUpPhotographer wrote in post #15413168
I want to get all this figured before i set up a shoot with a band and not go in completely clueless.
Good idea, but there's only one way to find out for sure 
HornsUpPhotographer wrote in post #15413168
But the 50mm would be great if I can get close enough and I feel lighting will be easier but honestly I want to have the freedom to move around and get shots from the back for full stage shots and get close enough but not have to disturb the fans.
The 50mm is a good place to start. And to find out whether you need wider or longer lenses. For wider: Try the kit lens (on the wide end, because it's least slow there). For longer: crop. Seriously. You won't be able to mimic a 200mm, but you could take a shot similar (not identical: DoF will be different) to what a 85mm would have gotten you.
Keep in mind that zooming most certainly does not take away the need for moving around! Zooming does nothing for perspective. And IMO, perspective can be one of the more important choices to make that reflect how an image will look.
Think of a zoom lens as giving "infinite perspective control", since you can zoom to keep framing of the subject constant, while simultaneously moving to alter perspective 
(Illustration on wikipedia: https://en.wikipedia.org/wiki/Dolly_zoom
)