One of my favorite albums from my college days was their "Ten Years Together". I guess it came out in 1970, and surely was tame compared to many of my other contemporary albums (Led Zeppelin, The Doors, etc.). but it was a GREAT collection of songs.

TIS, I urge you to check out some of their later works... they got into politically cool stuff for kids, and it's something wonderful for you to share with the grandkids now.... even a song like "Puff"... (they later changed it to add how boys AND GIRLS could love a rascal like Puff) - about how kids grow up and sometimes sadly leave their childish things behind.