Mike O'Donnell ... compose & arrange: music / composer: "Down By the Docks" / composer: Original Thomas Theme (157 episodes, 1984-2016)

Ed Welch ... theme tune / theme song / theme song: Roll Call / song / song by: "Roll Call" / song: "Roll Call" / composer: song / composer: theme music / composer: theme tune / songs (153 episodes, 2003-2019)

Steve D'Angelo ... theme tune: rearranger and performer / theme song: rearranger and performer / adventure song / song by: "Adventure Song" / song by: "A World of Wonder" (78 episodes, 2015-2019)

Terry Tompkins ... theme tune: rearranger and performer / theme song: rearranger and performer / song by: "Adventure Song" / adventure song / song by: "A World of Wonder" (72 episodes, 2015-2019)

Kevin Roberge ... theme song / song by: "Big World! Big Adventures!" / song: "Big World! Big Adventures!" / song by: "Don't Stop" (35 episodes, 2018-2020)

Carl Taylor ... theme song / song by: "Big World! Big Adventures!" / song: "Big World! Big Adventures!" / song by: "Don't Stop" (35 episodes, 2018-2020)

J. Eric Schmidt ... music composer (33 episodes, 1991-2003)

Junior Campbell ... composer: original theme / music arranger / composer: "Down By the Docks" / composer: Original Thomas Theme / composer: theme / performer: main theme (28 episodes, 1984-2016)

Noah Berg ... song by: "Big World! Big Adventures!" / song: "Big World! Big Adventures!" / theme song / song by: "Don't Stop" (18 episodes, 2018-2020)

Julian Nott ... music arranger / additional music (14 episodes, 1984-1995)

Paul Roberts ... music mixing (12 episodes, 2004-2006)

Bryan Daly ... music by (3 episodes, 2013)

Robert Hartshorne ... composer: songs / performer: "Down By the Docks" (2 episodes, 2010-2016)

Keith Hopwood ... additional music (1 episode, 1992)

Duncan Lamont ... additional music (1 episode, 1992)

Ryan Dunn ... song by: "Don't Stop" (1 episode, 2019)

Annalyse McCoy ... song by: "Don't Stop" (1 episode, 2019)