When I was 4ish in the mid-70s I listened to his Children's Concert at Town Hall record on my kiddie record player, obsessively. Abiyoyo was my favorite.
My parents took me to his concert, a typical outdoor folk-on-the-grass sort of thing. Halfway through I was crying; no Abiyoyo (was not a kid's concert). My father took me in hand up to the stage, and in a break, Pete noticed us and leaned down, and my father helped me stutter out my request; he gave the most twinkly of smiles and played it. One of my fondest, fondest memories of sheer joy found in music.