Hello!
This shouldn't be a rare one,must be rather well known I think.
Woman vocals,like Kylie or Danii Minogue (maybe) singing all the time in the lyrics nah - nah - nah - nah - nah - nananaaah,melodically.
Lyrics somehow

She is a queen of a his dreamS, na na na na na na naaah
When the make love is like a movie, na na na na na naaah
Shadows up and dancing, na na na na na naaah
the whole song goes like that,some lyrics and then na na na na na naah.

Turned out to be Saint Etienne - Pale movie.