That was from a live remote on Philly's WMMR from Sigma Sound Studios in February, '72. Gene Shay hosted. Freebo's on bass. I remember listening to the original live broadcast. Saw her in December, '72 at what was then Glassboro State College with John Prine and Jim Croce on the same bill.
The live remote included a great cover of Stephen Stills' "Bluebird":
And a song I would pay Ms. Raitt a big pile of money to play live one more time (if I had a big pile of money). Gets called out all the time in her Philly shows and She. Will. Not. Play. It. Ever. About the sexiest song I've heard: