Specifically, I am a concert photographer. On my Nikon D2x, I used 3 lenses, a 70-200 f/2.8, 50 f/1.8 and 17-35 f/2.8. All of these are great lenses, expensive and heavy. Having tried out the EM5 for concert work, I'm in love, and want to explore more with it in a concert setting. I was fortunate the concert I shot was in the daytime, as the lenses I have for the Oly are the 40-150 f/4-5.6 (not fast) and the 14-42 f/4-5.6 (I think anyway) also not fast. So, need some good glass for indoor work. Not entirely certain what my options are. Typically with a media pass, I get right up front to the action, so wider rather than long I think would be my initial preference, but I'm open to suggestions.