"Tomorrow Lies In The Cradle" by Fred Hellerman. The film "Wasnt That A Time" was shown as a public TV fundraiser the night after my son was born, and I was stunned.
"Witness To Joy" by Vance Gilbert (a duet sung with Patti of Tuck and...), although the words didnt strike me until about the third listening because their singing was so amazing.
"Teenie Weenie Meanie" by Reverend Billy C Wirtz. I never actually fell down laughing until I heard this the first time. (Nothing was said about IN WHAT WAY we were moved.)