Prior to joining Newstalk, Dunne worked on Today FM, presenting his "Pet Sounds" radio program, which began airing in 1999.

Dunne's former slot on Today FM was taken over by various guest presenters and later by Paul McLoone, who had previously worked as a producer on "Pet Sounds", from September 2008.

McLoone, who had previously worked as a producer on the Ian Dempsey Breakfast Show for five years until 2004, accepted the offer and returned to Today FM.

A month after Dunne's official departure from Today FM, McLoone made his own on-air debut as a radio presenter, during September 2008, with the show itself first airing at 7pm-10pm, then 7pm-midnight before receiving its final time slot of 10pm to midnight, until it was cancelled in 2021.

Dunne has appeared on various talk-based shows on Newstalk as an expert contributor for music-based discussions including, for example, following the death of a notable musician.

Newstalk was obliged to issue an on-air apology to Mary Harney after Nell McCafferty's comments on The Tom Dunne Show in 2010.

Dunne later took over the reins of Planet Rock Profiles from Dave Fanning, a programme that has aired on RTÉ, ITV, VH1, and many other TV stations around the world.