Help! experts on 70's music...

There was a song performed by a group of extraordinary african-american singers (they were several, like 6 o 8 people in total, males and females) around 1978-79, I don't know the title or the group's name, but part of the lyrics are like this:

You'll never know how much I want you
You'll never know how much I care
You'll never know how much I love you

You'll never know how much, how much
how much, how much, how much, how much how much...



Can you get me the name of the group and the tilte of the song???

Thank you guys


PS I'm sorry if this genre is not proper for this forum, honestly I'm new here and I don't know if we have people old enough to know something about a song like that

sounds a bit like the lyrics to a song called "FEVER"......

Thank you Maria, I really appreciate you tried to help me, you are a nice person, but unfortunately this is not he tune.

The one I'm talking about is the typical song of that time, Disco rhythm, instruments and voices. The video was in fact about this group dancing and singing on a disco, you know lights, mirror sphere and so on.