This has been making the rounds of the 'net — a musical number from a 1968 Red Skelton Hour with a group called The Young Folks and Red's special guest that week, Liberace. It's exactly what Paul Simon had in mind and it perfectly captures the hippie generation.
I'm sure I posted this long ago before everybody did but it seems to have somehow disappeared from this site and folks keep suggesting I post it. So here it is…