Steve Earle Emmylou Harris Hank Williams Sr. Lucinda Williams Bill Monroe The Carter Family Ralph Stanley Les Paul Gillian Welch Woody Guthrie Alison Krauss John Prine Dwight Yoakam Guy Clark Justin Townes Earle Levon Helm John Hiatt Willie Nelson Bob Wills Waylon Jennings Robert Earl Keen Rick Danko Roy Acuff Rodney Crowell Graham Parker Joe Ely Dave Edmunds Lyle Lovett Nick Lowe Mavericks James Mcmurtry George Jones Ryan Adams Hayes Carll Gillian Welch And David Rawlings Richard Thompson The Band Dave Rawlings Machine Bruce Springsteen Merle Haggard Bruce Cockburn John Hammond Elvis Costello Greg Brown Billy Joe Shaver Rosanne Cash Joe Jackson Jason Isbell And The 400 Unit David Olney