My favorite Byrds song was "Eight Miles High", and Crosby was still with the band at the time ... he received a songwriter's credit, although he may not have added much. There was a version the band preferred that wasn't used by the record label, but it became available long after the fact:
Here's the official version, with drums by Sina:
"Helplessly Hoping" by Crosby, Stills & Nash (written by Stills) was one of the only songs I ever sang on stage. Three of us played an acoustic set as an opening act for a metal band ... don't ask. "Helplessly Hoping" was one of our songs, and while my job mostly was to play bass while my friends sang real purty, "Helplessly Hoping" needed a third for harmonies. So there I was. Problem is, when I sing that song to myself, I end up doing the lead, and I kept coming in on the wrong note when we were together. So, even though we didn't have a bass in our version, as we began, I found my first harmony note on my bass and played it very quietly over and over until the singing began, at which point I sang the note from the bass and was able to continue with that harmony part of the rest of the song. (I didn't play that bass note after that.)
I saw CSN&Y once in 1974, and saw CS&N once in 1984 after a Giants game ... they played at second base.
"Love Work Out" was far and away my favorite song by Crosby & Nash. As I said on Facebook, "They are thankful for Danny Kortchmar and David Lindley on this track, as am I."
Finally, here is Grace Slick and Jefferson Airplane doing right by one of Crosby's songs, "Triad":