Brandi Carlile Anna Nalick Kt Tunstall Brandi Carlyle Old Crow Medicine Band Saving Jane Sandi Thom Indigo Girls Imogen Heap Ingrid Michaelson Davis Gray Kathleen Edwards Jann Arden Lene Marlin Lily Detaeye Frou Frou Hard Fi Nikka Costa Grace Potter And The Nocturnals Chris Pureka Gertrude'S Hearse Albert Hammond Jr Lucius Serena Ryder Uncle Tupleo Audra Mae Lucinda Williams Alison Krauss Amy Ray Gillian Welch Shawn Colvin The Secret Sisters Katie Melua Brandy Clark Feist Kina Grannis Wallin Jennies Catie Curtis Norah Jones Shawn Mullins Zee Avi Washington Social Club Las Cafeteras Andy Shauf Antony And The Johnsons Hot Club Of Cowtown Alexandre Desplat Rachel Ries James Blunt