The Troubador was destroyed by drugs.

In our day ... (late 60s, early 70s) Troubador acts included
   James Taylor ('68) on his 1st US tour (for Apple records)
   Joni Mitchell, Nina Simone, Laura Nyro, Tim Buckley stand out

As for David Crosby -
    We were punky kids in '65 and hung out at the 4th of July party
    thrown in Malibu, CA by Henry & Jane Fonda. The Byrds were the
    house band.

Here's a highlight of CSNY at Big Sur festival -
Crosby jamming in this 'Spanish Language' Big Sur Festival footage. He's at his best here (IMHO) https://youtu.be/K5E_TGIr7S4

Fair winds Mr. Crosby and thanks for your life in music
voyager