it's a cover of "upside down" by Diana Ross - I heard it in virgin records, it sounds like a continuous mix, the next track sounded like 'reach up' by perfecto allstars - what is the artist??, what is the album??
Could be form "2 many DJ's"? a very good continous remix of LOADS of songs both old and new. Next time that happens, go to the desk and ask what CD they're playing...