- John Baggot – keyboards
- Teddy Borowiecki – piano, accordion
- Andy Brohard – assistant engineer
- Heather Brown – backing vocals
- Chris Bruce – guitar (acoustic), bass
- Peter Buck – guitar, mandolin
- Denyse Buffman – viola
- Jamie Candiloro – engineer
- Larry Corbett – cello
- Nikka Costa – vocals
- Wayne Coyne – guitar (acoustic), vocals
- Steve Cradock – guitar
- Ryan Cross – cello
- Josh Cunningham – guitar (acoustic)
- Shawn Davis – bass
- Vinicius Felix de Miranda – guitar
- Joel Derouin – fiddle, violin
- Mario Diaz – engineer, editing
- Dido – vocals
- Craig Doubet – engineer
- Steven Drozd –guitar, keyboards, vocals
- Brandon Duncan – engineer
- Charles Floyd – conductor
- Danny Frankel – drums
- Sia – vocals
- Angela Gannon – percussion, vocals, melodica
- Sean Gannon – drums
- Adam Grace – keyboards
- Ray Guarna – engineer
- Lisa Hannigan – vocals
- Nic Harcourt – producer, liner notes
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- Missy Higgins – guitar, piano, vocals
- Daniel Huffman – keyboards
- Michael Ivins – bass, keyboards
- Gary Jules – guitar (acoustic), vocals
- Greg Kurstin – keyboards
- k.d. lang – vocals
- Mark LeCorre – engineer
- Greg Leisz – guitar
- Joshua "Trumpet Solo" Lopez – guitar, backing vocals
- Adam MacDougall – keyboards, backing vocals
- Ed Maxwell – bass
- Ariana Morgenstern – producer
- Jared Nugent – assistant engineer
- David Palmer – keyboards
- David Piltch – bass
- Robert Plant – vocals
- Damien Rice – guitar, vocals
- Michelle Richards – violin
- Marcelino Sanchez – intern
- Jacob Sciba – assistant engineer
- Al Sgro – percussion, backing vocals
- Chris Stills – guitar, vocals
- Michael Stipe – vocals
- Romeo Stodart – guitar, piano, vocals
- Skin Tyson – guitar
- Rufus Wainwright – guitar, piano, vocals
- Matt Ward – guitar, harmonica, piano, vocals
- Joey Waronker – drums
- Paul John Weller – guitar, vocals
- Jason Wormer – engineer
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