My daughter has a Christmas Concert tomorrow. What lens should I use? Nikon D7000?

I posted this question earlier but forgot to mention I have the Nikon D7000 and that the school concert is in the gym. And I have no idea where I'll be able to get a seat. I can't guarantee that I would be in the front row

What lens should I use
My wide Angle Lens 18-105mm…
or the 70-300 mm lens or the 50mmf/1.8

Take both, and then depending on the situation, use whatever you like!

You mean you don't always have all your lenses with you? There's no point in having them if you only take one and keep the others sitting at home. The point of the DSLR is the ability to CHANGE lenses when needed. Use the one that best fits the circumstances when you get there.

My suggestion would be if you are not TOO far away, to use the 50 mm for the much larger aperture, so that you can use a little lower ISO for better quality photos.

Okay, it's good that you have a D7000, because it does pretty well in low light. You are going to need ISO 1600 or 3200 in a gym. You might be ridiculously far away or you might be fairly close. I still say, take both zooms with you. Chances are the 18-105 will be the lens you use, unless you only want close-ups of your own child.

Lighting will be an issue for metering, as well. Do not use "P" mode unless you plan on using some ev compensation. Take a few pictures that you don't care about and check the LCD monitor to see if you need to dial in some ev compensation. You wil probably have to take it down a couple of stops (-2.0 ev) if the gym is dark and the stage area is lit. My choice would be to use a spotmeter on one child who is wearing a "neutral" value clothing, like green or tan - not white, and use manual settings.

Hey, I have no problem with you posting SIMILAR questions more than once. You have added an important detail here - the exact camera you will be using. This makes a difference in how the lens acts and how the camera behaves in low light.