Here’s some assorted old stuff:
“Astronomy Domine” or “Careful With That Axe, Eugene”, by Pink Floyd, from Ummagumma.
“Fishin’ Blues”, by Taj Mahal, from The Real Thing.
“Sweet Jane”, by Lou Reed, from Rock & Roll Animal.
“Bertha”, “Mama Tried”, “Wharf Rat”, “Not Fade Away”, or “Goin’ Down the Road Feelin’ Bad”, by the Grateful Dead, from Grateful Dead (“Skull & Roses”).
“Who Do You Love”, “Universal Mind”, “Build Me a Woman”, or “Celebration of the Lizard”, by the Doors, from Absolutely Live. (None of those tracks appeared on any of their studio albums.)
“Goin’ Down Louisiana”, “Back Door Man”, etc., by the Blues Project, from Live at the Cafe Au Go Go.
“I’d Rather Be the Devil” or “Dust My Broom”, by Canned Heat, from Live at Topanga Corral.
“Lover of the Bayou”, by the Byrds, from (untitled).
And for a good voice-over bed – “Mountain Jam”, by the Allman Brothers, from Eat A Peach.