Last time I saw them in concert (Hell Freezes Over) Glenn's vocals and guitar were spot-on, actually, the whole band was. RIP Glenn.
This knocked loose a forgotten memory....
Circa 1975, there was a benefit concert for the Chumash tribe at Cuesta College, near San Luis Obispo CA, featuring the Eagles. I wasn't planning on going, until my sister called the afternoon before the concert and told me that Neil Young was also going to perform. She worked in a music store, and said she had two tickets left, and I could have one if I acted fast.
I made it to the auditorium (actually an indoor basket-ball court) in record time, and got a seat on the hardwood floor, right in front of the "stage", which was one of those fold-out jobs about 18-24" high, common in the local schools.
Neil came out first, and played a solo song, then the Eagles played back-up to a couple of Neil's songs, then Neil played back-up to a couple of Eagle's songs. It was the best jam session I've ever witnessed...