From the video credits:

Directed by Joel Trussell

M. Ward — piano/guitars/voice
Steve Shelley — perscussion
Toby Leaman — bass
Tom Hagerman — strings
Amanda Lawrence — violin
Jon Graboff — pedal steel
Recorded by Tom Schick at Magic Shop in NYC
Mixed by Mike Mogis at ARC in Omaha, NE

Animators:
Joel Moser
Marius Alecse
Gene Blakefield
Kelly Turnbull
Frank Macchia
Adam Scarpita

Compositor:
Tony Christopherson

Thanks to Six Point Harness Animation Studios