No hope, song without lyrics from the (i guess) 90s
 

I used to hear it in the 90s on tv when i was a little kid. It is a woman just doing noises with her mouth. I think it is the Scatman kind of song that you know it or not.
I had to whistle it , again, it has no lyrics. Quite embarassing, but here it is:

soundcloud.com/mitiera2015/rec

Thank you for any help.

Is there any other instruments in the song?

Yes, i remember a piano after the woman hums the song. Her voice was very high and the piano very low.

Not sure that it sounds like the clip you posted but your description makes me think of Gypsy Woman by Crystal Waters.