BS&T version and No. 2 hit in 1969 gives an extra dimension to the earlier versions by Peter, Paul and Mary and the song writer, Laura Nyro.
Written (and sold to Peter, Pail and Mary) at the tender age of 17 by Laura Nyro
According to David Clayton-Thomas, Nyro was the girlfriend of Blood Sweat & Tears’s bass player. She asked David if he was interested in hearing her work, and she played 5 songs for him, and the rest is history!