- Candi Staton
- Doris Day
- Alexander Rybak
- Randy Travis
- DMX
- Tim McGraw
- Alan Jackson
- Harry Belafonte
- Collin Raye
- The Karaoke Channel
- Charlotte Church
- Louis Armstrong
- Heather Morris
- Alan Parks
- Napoleon Hill
- Perry Como
- Il Divo
- Judy Garland
- Willie Nelson
- Justin Bieber
- Brenda Lee
- Kenny Rogers
- Carrie Underwood
- Sarah McLachlan
- Ryan Adams
- Glen Campbell
- Keith Urban
- Hudson Taylor
- Sadhguru
- Paul Potts
- Knightsbridge
- Martin Luther King Jr.
- Ludwig van Beethoven
- Marvin Gaye
- Byron Katie
- LeAnn Rimes
- Al Green
- Liam Lawton
- Bill Withers
- Snoop Dogg
- Brad Paisley
- Daniel O'Donnell
- Skillet
- Dolly Parton
- Sam Cooke
- Patsy Cline
- Nana Mouskouri
- Nina Simone
- Don Mclean
- Hayley Westenra
- Barack Obama
- Jim Johnston
- Alison Krauss
- Lighthouse Family
- Gary Chapman
- Tina Turner
- Cat Stevens
- Wolfgang Amadeus Mozart
- The Hit Crew
- The City of Prague Philharmonic Orchestra
- James Morrison
- Diana Cooper
- London Philharmonic Orchestra
- Johnny Cash
- Kelly Rowland
- Whitney Houston
- Etta James
- Stephen Miller
- Dionne Warwick
- Mark Forrest
- Westlife
- Bob Dylan
- Katherine Jenkins
- Bill Medley
- Aretha Franklin
- Eva Cassidy
- Tommy Fleming
- Nat "King" Cole
- Bronnie Ware
- London Symphony Orchestra
- Martina McBride
- Pentatonix
- Margo
- Sixpence None the Richer
- Elvis Presley
- Patrick Feeney
- Alicia Keys