My last public performance for money was in 1967. For free it was 1972 with the exception of two little one-shot one-song things. But that's just for friends out of friendship for the people involved and also because it was fun.
You are almost not free if you are teaching a group of graduate students to become friends with one of them. I don't mean anything erotically charged just a friendship.
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My first experiences of academic friendship made me smile in after years when I looked back on them. But my circle of acquaintances had gradually grown so large that it was only natural new friendships should grow out of it.
