Yeah, Mick, the Springfield were great. I try to play Expecting to Fly once in a while, but the beat changes play havoc with me. What was the song that went "when the dream came I held my breath with my eyes closed"?I was a big Byrds fan '63-67, and loved Turn,Turn,Turn, Fifth Dimension and their other albums of that era. I started to lose interest about the time Crosby left and they recorded The Notorious Byrds Brothers. In retrospect, I've re-discovered many recordings from this era that I missed at the time, including the great Sweetheart of the Rodeo.
Another favorite was The Lovin' Spoonful. I also liked a couple of the Turtles' Dylan covers and even some of the Mamas and Papas hit material. Jefferson Airplane and the Grateful Dead had roots in Folk, though they followed other roads. Fairport Convention was a great Folk rock band, and were my intro to a lot of British Traditional music.
Funny thing about "folk-rock" though. In 65 and 66 when it was trendy, everyone, including the Beatles, was doing it. Rubber Soul and Revolver were essentially Folk rock albums, and groups from Jethro Tull to Led Zeppelin were incorporating the sound.