Jeez - There are so many great songs that all of these guys sang - Leadon included. The unique qualities and tone of their individual voices are special enough, but when they harmonize - fuggetaboutit.
@jerry - thanks so much for posting the Poco clip. LOVE me some Poco as well - you've inspired me to dig out my Poco CD's. It reminded me as well of how much I was influenced by Tim Schmit and his "hippy refin" Jazz basses. My first group was a country rock band that began in 1979. Because my bandmates harmonized beautifully, we played dozens of Eagles tunes & some Poco as well. I started playing Jazz basses in the early 80's, back in the day when you could easily find refinished Pre-CBS basses in the Recycler for $300-$400.