Aren't they still using the same jingle they've been using for the last 30 years (they re-record it in different styles to match the visuals, but it's always the same basic tune)? Assuming they are, it's just a jingle they had written for them, it's not actually a full song.
it was a song,i had it on a love song album in the late eighties,i cant remember the name or singer,i'll keep looking and post my findings,oh by the way,some of the lyrics"only the tenderest love that you give me,feels like love that i've been waiting for"