- Max Giesinger
- Eric Clapton
- Ingrid Michaelson
- José González
- Joshua Kadison
- Sharron Levy
- Boyce Avenue
- Jonathan Jeremiah
- Kris Kristofferson
- Alabama Shakes
- William Fitzsimmons
- Edoardo Bennato
- Son of the Velvet Rat
- Sandi Thom
- The Lumineers
- Tim Buckley
- Richie Havens
- Judy Collins
- Claudia Koreck
- Dean Martin
- Chris Norman
- Hannes Wader
- Vitamin String Quartet
- Simon Lewis
- Jack Savoretti
- Annett Louisan
- Emmylou Harris
- The Pogues
- Joan Baez
- Nina Simone
- John Denver
- Alan Sorrenti
- Ryan Adams
- Tracy Chapman
- Anna Naklab
- Amos Lee
- Stevie Wonder
- Vanessa Carlton
- Leonard Cohen
- Arlo Guthrie
- Vasco Rossi
- Gabrielle Aplin
- Nico Santos
- Tom Petty & The Heartbreakers
- Avec
- Jason Walker
- Zac Brown Band
- Olli Schulz
- Sparks
- Rufus Wainwright
- Tyler Ward
- Newton Faulkner
- Melanie
- Eddie Vedder
- Brandi Carlile
- Konstantin Wecker
- Sheryl Crow
- Donovan
- Tom Odell
- Funny van Dannen
- Ernst Molden
- Ben Harper
- Ernst Molden
- Ben Harper
- Jim Croce
- John Paul Young
- Virginia Ernst
- Birdy
- Wilfried
- Joshua Radin
- Truck Stop
- Katy Perry
- Ray LaMontagne
- George Harrison
- Reinhard Mey
- Willie Nelson
- Philipp Poisel
- Nat "King" Cole
- Lou Reed
- Scott Matthew
- The O'Jays
- Bob Dylan
- Carole King
- Fleet Foxes
- Neil Young
- Der Nino aus Wien
- Norah Jones
- The Andrews Sisters
- The Paper Kites
- Mike Krüger
- Coshiva
- Sinéad O'Connor