Here's a sketch I did last night at a concert of the Bard College Orchestra. I was sitting about four rows back.
Since some of you have asked about materials, here's the lowdown: I was using a black watercolor pencil and three waterbrushes. One was filled with Higgins Eternal ink, another had plain water, and a third contained blue-black fountain pen ink. The sketchbook was a Moleskine watercolor notebook.
Previous concert sketches on GJ:
Club Passim Gig
The Cello and the Pencil