We’re Dancin’ 'Til It Blows Over by Second Helping, which is Quebec rock legend Michel Pagliaro, adopting a group name before just going by his last name. Great song, great singin’, great playin’. Deadly obscure and rare, not on an album and never issued on CD. (I have the only two copies I’ve ever seen.) Michel made a string of really good English pop records in the early-to-mid '70s. He’s well-known for Lovin’ You Ain’t Easy, but not a lot of folks have heard Sure Maybe. The vast majority of his material is in French. The best one I know of these is “J’entends frapper.”
I second the Emitt Rhodes mention. I have all his stuff, including The Merry-Go-Round records.
Thumbin’ A Ride by Jackie Lomax. Cover of a Coasters song. Incredible B-side of a wholly unremarkable single on Apple Records, which features George Harrison on lead guitar and Paul McCartney on drums.
Walk That Walk by David Clayton Thomas.
Any Other Way by Jackie Shane.
Mighty Man by Mungo Jerry.
Berkeley Mews by The Kinks.
Rock And Roll Band by Billy Mysner (aka Bill Marion)
Too True Mama by Crowbar
Buffalo Grass by Doug Feaver. This might win the obscurity award. I’m not aware of him ever having made a recording of it, despite having performed it hundreds of times. I’m not likely to ever run into anybody who even knows who he is.