I believe your best bet is with the Bowling Green State University.
Their Archive of Popular Music got its start back in the late 60s.
https://www.bgsu.edu/library/music.htmlTRO, inc. in the late 60s and 70s
were involved with publishing lots of folk music...Pete Seeger, Hudie
Leadbetter, et al. As their Information Manager, I'm not aware we had
interview tapes, but quite a lot of LPs and song sheets.
On 1/25/2019 11:03 AM, David Rahtz wrote:
> I’m working on a feature-length documentary about Laurel Canyon during the
> late 1960's and early 70’s. We’re aiming to tell the story using firsthand
> accounts by the artists, musicians, and producers that lived it.
> Any recommendations on Library or Museum Collections, Oral History
> Collections, or private collectors that might have audio interviews with
> the artists below would be greatly appreciated.
> Any assistance in this matter would be greatly appreciated Thank you for
> your time and expertise.
> Joni Mitchell
> Neil Young
> David Crosby
> Graham Nash
> Stephen Stills
> Linda Rondstadt
> Jackson Browne
> Jim Morrison
> Frank Zappa
> Carole King
> John Mayall
> James Taylor
> JD Souther
> Judee Sill
> Buffalo Springfield
> The Byrds
> Canned Heat
> The Doors
> Mamas & the Papas
> The Monkees
> The Turtles