Brandi Carlile
Luke Bullendrums (drum set), glockenspiel
Jane Scarpantonicello
Rich Mercuriodrums (drum set), percussion
KT Tunstallvocal, rhodes piano, glockenspiel, xylophone, toy piano
Alice Smith
Topher Mohrguitar
Riley Gearekeyboard, bass
Alex Elenadrums (drum set)
Holly Conlanvocal, piano, rhodes piano, glockenspiel, chimes
Al Sgrovocal, percussion, drums (drum set), guitar, bass
Brad Gordonclarinet, trumpet, additional, piano
Joseph Conlanbrass
Ryan Macmillanpercussion, drums (drum set)
Ed Maxwellbass
Matt Beckukulele, electric piano, electric guitar
Greg Collinspercussion, mellotron, acoustic guitar
Stewart Coletrumpet
Katy Perry
Butch Walkerpercussion, guitar, keyboard, bass, instrument, vocal
Darren Dodddrums (drum set)
Priscilla Ahn
Siggi Sigtryggssonperformer
Simon Davisperformer
Kate Havnevik
Catherine Feeny
Jon Neufeldguitar
Sebastian Rogerswurlitzer electric piano
Buddy
Tim Jones
Joshua Radin
Marié Digby
Cary Brothers
Jim Bianco
Sara Bareillesvocal, piano
Katie Herzig
Jesca Hoop
Laura Jansen
Greg Laswell
Anya Marina
Ingrid Michaelsonvocal, glockenspiel, ukulele
Lenkavocal, keyboard, glockenspiel, piano
Jonah Matranga
Colbie Caillat
Meikovocal, acoustic guitar
Fiona Apple
Nicole Atkins
Kevin Salembass, guitar
Oliver Krauscello
