It is a female Blues Singer . I remember the lyrics - Sister , you have been on my mind ...

From just that it sounds like it might be "Miss Celie's Blues" performed by Tata Vega. Do the lyrics continue with... "Sistah, we're two of a kind... So, Sistah, I'm keepin' my eye on you" ?? If so, it can be found on The Color Purple Motion Picture Soundtrack produced by Quincy Jones.

It was on the movie " The Colour purple " . I thankyou for the indentification .

Glad to help! The entire soundtrack is excellent - when you've got a producer like Quincy Jones it's hard to go wrong. There's another remarkable gospel/blues performance by Tata on that CD called "Maybe God's tryin' to tell you somethin" She has a remarkable voice that can be quite gritty (like Tina Turner) and a great range. Not sure why isn't more in the mainstream.