Scarbury went on to work with Post again in the mid 1980s to record the song `` Back to Back '' , for the television series Hardcastle and McCormick and teamed up with Desiree Goyette to record `` Flashbeagle '' for the Peanuts special It 's Flashbeagle , Charlie Brown . He went on to work with Post again in the mid-1980s to record the song `` Back to Back '' for the television series Hardcastle and McCormick and teamed up with Desiree Goyette to record `` Flashbeagle '' for the Peanuts special It 's Flashbeagle , Charlie Brown .