Some notable past performers:
Joseph Arthur
Citizen Cope
Ron Sexsmith
Marshall Crenshaw
Tom Morello (Audioslave/Rage Against the Machine)
Butch Walker
Teddy Geiger
Antigone Rising
Amos Lee
Marc Broussard
The Click Five
Cracker
Unknown Hinson
Tommy Ramone (The Ramones)
Jolie Holland
Pernice Brothers
Jesse Malin
Marah
Kill Hannah
Laura Veirs
Damien Jurado
The Innocence Mission
Rich Robinson (The Black Crowes)
Boots Riley (The Coup)
The Plimsouls
John Doe
Steve Forbert and the Sound Benders
Ingrid Michaelson
Joshua Radin
Cary Brothers
Billy Sheehan
Bob Schneider
Leon Russell
Glenn Tilbrook (Squeeze)
Chris Difford (Squeeze)
Chuck Prophet
The Rocket Summer
Dustin Kensrue (Thrice)
All Time Low
Flickerstick
Billy Joe Shaver
Charlie Louvin
Pete Best (The Beatles)
Jesse Colin Young
Denny Laine (The Moody Blues, Wings)
Adrian Belew
Paramore
Washington Social Club
Mat Kearney
Blue Merle
Apollo Sunshine
Uncle Earl
The Samples
Brandi Carlile
Sonya Kitchell
Andrew Bird
Glen Phillips (Toad the Wet Sprocket)
Ken Andrews (Failure, Year of the Rabbit)
The Autumn Defense
Soldiers of Jah Army
Army of Me
Pat McGee Band
Eric Hutchinson
Matt Nathanson
Stephen Kellogg and the Sixers
Dilana from Rockstar: Supernova
Joey McIntyre (New Kids on the Block)
P.M. Dawn
Angie Aparo
Matt Wertz
Griffin House
Kaki King
Bill Kirchen and Too Much Fun
Steve Forbert and the Sound Benders
Michael Tolcher
The Ditty Bops
Ralph's World
Justin Roberts
Milkshake
David Lindley
Tim Easton
Robbie Fulks
Johnny A
Agents of Good Roots
Eddie from Ohio
The Bobs
Alex Skolnick (from Testament)
David Mead
Hayes Carll
Girlyman
The Plimsouls
Chris Barron (Spin Doctors)
Toby Lightman
Harry Shearer
Susan Werner
Pierre Bensusan
Dan Bern
BR549
Robinella
Braddigan from Dispatch
Charlotte Martin
Brindley Brothers
The Holmes Brothers
Nappy Brown
California Guitar Trio
Jimmy Gnecco (OURS)
Karan Casey
Slaid Cleaves
Catie Curtis
Da Vincis Notebook
Pat Dinizio (The Smithereens)
Fred Eaglesmith
Jules Shear
Stacey Earle and Mark Stuart
Michael Fath
Melissa Ferrick
Jeffrey Gaines
Eliza Gilkyson
Hamell on Trial
Corey Harris
Toby Lightman
Alvin Youngblood Hart
Ari Hest
Freedy Johnston
Josh Joplin
John Jorgenson
Phil Keaggy
The Kennedys
Will Kimbrough
Jeff Lang
Jim Lauderdale
Adrian Legg
Michelle Malone
Amy Rigby
Lori McKenna
Erin Mckeown
Peter Mulvey
The Nields
October Project
Over the Rhine
Ellis Paul
Pierce Pettis
Kelly Joe Phelps
Harry Shearer
Cary Pierce (Jackopierce)
Steve Poltz
Willy Porter
Mary Prankster
John Renbourn
Jane Siberry
Mekons
Richard Shindell
Chris Stamey
The Strawbs
Ken Stringfellow (Big Star, The Posies)
Jesse Sykes and The Sweet Hereafter
Ben Taylor
Sally Taylor
Teitur
Rosie Thomas
Peter Tork (The Monkees)
Brian Vander Ark (The Verve Pipe)
The Push Stars
Chris Whitley