A sketch! A sketch!

Can you tell what it is yet (because the quality isn't great)?

I don't know his name, but he plays the double bass with the Philharmonia and he was resting and having a little think, mid-"Rite", so I drew him.

Many thanks to Viveka Gaillard for her help - but I can see I'm going to have to find a better system for this. Still it's a start - this is what my thumbnail sketches look like and I have a gazillion more of them, as well, now, as two large A1 mixed-media drawings worked up from them.