The music in my head goes round and round

Like a lot of people, I sometimes get a tune in my head which I just can't get rid of. I can get 'infected' by just about any catchy tune - but there is one little bit of music that keeps coming back again and again. It's not like its even music with a name - not that I know of anyway. It is, however, from a film. It's from 'Midnight Cowboy' it is the jingle from the Florida orange juice advert that plays on Joe Buck's radio while Joe and Ratso dance around their freezing squat trying to get warm. As I remember it, the music carries on as the film melts into Ratso and Joe's fantasy of living the high life on a beautiful hot day, beside a swimming pool, surrounded by voluptuous women.