"I wrote 'These Days' before I met Gregg. He heard me play the song when we were first friends, I guess we were probably both 18," Jackson Browne tells Blackbird about Gregg Allman in this concert clip. "The way he did that song completely changed it, I think for me and for everybody... I could write a song like that but when it came time to singing it, Gregg really gave it a kind of graveness and gravity that the song can hold." Relive the magic of Gregg and Jackson performing "These Days" together for the first time, right here.