The song "Sammy's Super T-Shirt" was written and performed by Harry Robinson, who's also famous for the song "Hoots Mon (There's A Moose Loose About This Hoos)".
Harry Robinson, who composed the incidental music for Sammy's Super T-Shirt, also wrote the soundtrack to the 1978 public information film, Play Safe. Consisting of three short films, the same music can be heard, albeit in more electronic form, in the Frisbee segment.