Who sang Mary J Blige's I'm Going Down originally?

I need to find it so that I can find the instrumental.....

It was Rose Royce.

http://www.amazon.com/Very-Best-Rose-Roy...

rolls royce did, and they sung the song called "car wash" too.

Roses Royce sung the song first.Then MJB did the song for her 1994 album My Life.She said it was a classic her mom played alot back then.She said the reason why she recorded it was bcause at the time she was going down.