Hayes was born on August 20, 1942, in Covington, TN; his parents died during his infancy, and he was raised by his grandparents. After making his public debut singing in church at the age of five, he taught himself piano, organ and saxophone before moving to Memphis to perform on the city's club circuit in a series of short-lived groups like Sir Isaac and the Doo-Dads, the Teen Tones, and Sir Calvin and His Swinging Cats. In 1962, he began his recording career, cutting sides for a variety of local labels.
Two years later, Hayes began playing sax with the Mar-Keys, which resulted in the beginning of his long association with Stax Records. After playing on several sessions for Otis Redding, Hayes was tapped to play keyboards in the Stax house band, and eventually established a partnership with songwriter David Porter. Under the name the Soul Children, the Hayes-Porter duo composed some 200 songs, reeling off a string of hits for Stax luminaries like Sam & Dave (the brilliant "When Something Is Wrong With My Baby," "Soul Man," and "Hold On, I'm Comin'"), Carla Thomas ("B-A-B-Y,") and Johnnie Taylor ("I Got to Love Somebody's Baby," "I Had a Dream").
In 1967, Hayes issued his debut solo LP Presenting Isaac Hayes, a loose, jazz-flavored effort recorded in the early-morning hours following a raucous Stax party. With the release of 1969's landmark Hot Buttered Soul, he made his commercial breakthrough; the record's adventuresome structure (comprising four lengthy songs), ornate arrangements, and sensual grooves -- combined with the imposing figure cut by his shaven head, omnipresent sunglasses, and fondness for gold jewelry -- made Hayes one of the most distinctive figures in music.
After a pair of 1970 releases, The Isaac Hayes Movement and To Be Continued, he reached his commercial zenith in 1971 with the release of Shaft, the score from the Gordon Parks film of the same name. Not only did the album win Hayes an Academy Award for Best Score (the first African-American composer to garner such an honor), but the single "Theme From 'Shaft,'" a masterful blend of prime funk and pre-rap monologues, became a number one hit.