Musicians in the neighbourhood- 4

Another sketch session at my neighbour's place. Usually the music drifts in and out when I concentrate on drawing. I mean, I hear the music but I don't always hear the music, if that makes sense. Today the trio practice didn't go very smooth. There was more stopping and starting-over. At one point I could feel the frustration in the air. Interestingly, my pen couldn't move smoothly on paper either when the music wasn't flowing. I had a few sketches discarded halfway as well, which doesn't happen often. I guess my brain does listen to the music even I don't always hear it.