two of our friends here in france are classic opera trained singers who do concerts but also Alex is a folk singer and they do gigs both here in France and back in the UK, I have done a few shoots for them and as others will know and say - you have virtually no control over the location / background / lighting / angles of access for shots, one 'tool' I have used is when the mood of the music they are performing allows i 'interpret' the shot to suit, so convert to B&W, then add a sepia tone and a fade out effect to lose the clashing colours and clutter that otherwise distracts the eye, If you provide your images to the artist you often get better access next time and in my case a cd and cd sleeve cover shot - its not my top subject matter but as they are friends i was happy to bend my skills their way - and it was fun.