HRB Music is the music group that composed the theme song and incidental music for Underground Ernie.
When the show was being produced, co-creator Sid Rainey bumped into frontman of the Wonder Stuff Miles Hunt in a chance meeting where they discussed what they were working on at the time. This led to a series of discussions regarding the Wonder Stuff performing the theme tune and composing incidental music for the series. The score was eventually credited to HRB Music (Hunt, Rainey, Bell)
- At one stage, a soundtrack album to accompany the series was to be released but this never followed through.