White died Wednesday in Nashville, according to his label, Yep Roc Music Group -- however, they did not release details about the cause of death.
He performed and wrote tunes in several genres -- including country, rock, blues and R&B -- but scored his biggest hit for himself with 'Polk Salad' in 1969.
He also wrote the hits "Rainy Night in Georgia" for Ray Charles ... "Undercover Agent for the Blues" and also "Steamy Windows" -- which Tina Turner turned into a Top 40 hit when she covered it in 1989.
Over the course of his career ... Tony recorded 20 albums, with the most recent one being "Bad Mouthin'," which released was on September 28 of this year.
He was 75.