Reg,
The stuff he found totally on his own was probably Beach Boys, Michael Jackson, Earth Wind & Fire, Weird Al and Rush. Stuff I played (only a little but may have introduced him to) would include Beatles, Steely Dan, Yes, etc.
I've tried to get him to love Kevin Gilbert, for example, but it wasn't an immediate take. He liked it, though. I've played him David Baerwald, but I also think he doesn't quite hear or understand the lyrics there yet. He will eventually. He found Snarky Puppy on his own.
