Shooting a concert outdoor with plenty of light is relatively simple. Shooting a concert indoor, NOT in the press pit and surrounded by horde of dancers is not as easy. Things get more complicated if you are dancing while shooting, which put my Alpha's sensor stabilizer under exteme pressure.
But how much fun. This was my first time and I went through a steep learning curve, not sure I could have pulled any shot in almost complete darkness and with the poor ISO performance of my entry level DSLR.
But the biggest killer was focusing in low light, that's where I missed most shots.
I shot with a 50mm at 200 ISO, 1/80s, from -1EV to -2EV, centered metering and whatever aperture came out (usually wide open at f1.7).
Dreamstime accepted three shots out of this session so far and I'm extremely happy. And the concert was great!