Sadly, it is a real song, sung by the immortal Joey Scarbury (and written by Mike Post who also wrote the theme songs for such tv classics as NYPD Blue, Hill Street Blues, Rckford Files, the White Shadow, the A Team, and Law and Order among others).

Unfortunately, for myself, I have had the damn thing stuck in my head all day. Oh well, I have no one to blame but myself, believe it or not (I'm walkin' on air I never thought I could feel so freeeeee!)