I was in your shoes about 6 weeks ago. I was invited to a recording session (in studio) and encouraged to photograph, with all due discretion of course, the musicians doing their thing(s).
The thought of shooting available tungsten light made me very nervous. To make matters worse, I was using Hasselblad gear (maximum aperture f4.0). Add some depth of field, a couple of stops for the 80B, and all bets were off.
I went loaded for bear, Portra 400 NC + VC, Portra 800, Fuji 800 Z, two Metz heads w/ grids, snoots, shoot-through umbrellas, Pocket Wizards, and last but not least, ye old color meter lll.
I lucked out. The hot lights in the studio were gelled Arri heads with an assortment of CDM's (ceramic metal halide) registering 5600°K.
The control room was a different story. First, I went with the 80B, Portra 400 VC, f 11.0, @ ¼ sec on a tripod. Second, I pulled the filter, dropped to f 16, popped a single strobe into a corner and dragged the shutter.
The funny thing is, while I'm happy with my film from the Hasselblad, I'm happier with the test shots from my G9. This, of course, will change after I enlarge the negatives. I now have 5 rolls each of the Portra 800 and Fuji 800 Z that I will probably never shoot.