I've been asked to provide music for a Sunday School cook-out next week. The group is 40-50 years old, so I thought I'd do "sing-alongs from high school days." What I'm looking for are songs we sang in the late 60s early 70s at church campouts, etc. I'd like suggestions for top 10 Christian and top 10 folk/general (Some fit in both categories). The ones to came to my mind immediately are:

"Blowing In the Wind"
"Do Lord"
"I Have Decided to Follow Jesus"
"If I Had a Hammer"
"Kum-ba-yah"
"Michael Row the Boat Ashore"
"Nah-Nah Nah Nah, Hey Hey Good-bye" (I know it's not folk, but the non-musicians enjoy playing along on their coke cans)
"Pass It On"
"The Last Thing on My Mind"

I'm sure there are dozens of others that when you post them I'll say "Of course, how could I have forgotten that one?." So, please offer suggestions.

Thanks!