[2] David worked as a courier after school and later, for about ten years, had a weekend job in Montreal selling appliances at a Sears store where he became fluent in English.

[1] David's main musical influences in his youth were Les Classels and musicians Dennis DeYoung and Chris de Burgh, whose voices made him want to take up singing.

[1][2] In 1999, David joined the rock band Mystery as lead singer and features on the studio albums Beneath the Veil of Winter's Face (2007), One Among the Living (2010) and The World Is a Game (2012).

[4] In 2008, David was announced as the new frontman of Yes, which at the time featured a line-up of Steve Howe, Chris Squire, Alan White, and Oliver Wakeman.

[5] David was brought in after Anderson was diagnosed with acute respiratory failure earlier in the year, and needed time to recover.

[2] He wanted to avoid holding the band up, considering he had no idea how much time he needed to recover from his illness, and for Yes to continue performing for the fans.