Philip Graham wrote:

One of my great memories is seeing the Byrds and Burrito Brothers share the stage at Carnegie hall, when Gram Parsons was still in the band. I caught the later Rick Roberts era Burritos too, also memorable!

By the way, today the website "3 Quarks Daily" features my long essay on The Byrds, "My Fan Notes". 

It's the confessions of a devoted fan, from 1965 through to the early 1970s. 

Your readers might enjoy it:

https://3quarksdaily.com/3quarksdaily/2021/01/my-fan-notes.html#more-191104