I have spent most of my career painting trees, and I am not very proficient at people, but I do really love sketching musicians. I play bass and banjo myself (purely for my own enjoyment), and I love the shapes of instruments juxtaposed with the shapes of people. Also, musicians hold still, somewhat, and are used to being stared at. So they make good sketching subjects. And it gives me something to do with my eyes while I listen to live music. My musician friends are patient and used to my sketching them, and I appreciate it.