We went to the Acoustic Alchemy concert at Tupelo hall last night with some firends. I took the GH2 along with the Panasonic 1.7/20 and my trusty Takumar 1.4/50. I was more interested in seeing how well the camera did in the natural light stage conditions than documenting the show. I'd say it did very well. Both lenses were plenty fast and I was able to shoot at ISO 400, though I also used ISO 1600. The 1600 is a bit grainy if blown up but otherwise very acceptable. I had no particular problems with metering though I did switch to spot metering since the heads right in front of me were blocking about 40% of the images. Focusing with the Takumar was a little tricky. The images are sufficiently sharp for the conditions. I was shooting at about 1/25 to 1/100th and the guys on stage were NOT standing still! Great music.