In Memphis, Stax Records produced recordings by soul pioneers Otis Redding, Wilson Pickett, and Don Covay. Other Stax artists such as Eddie Floyd and Johnnie Taylor also made significant contributions to soul music. By 1968, the soul music movement had begun to splinter, as James Brown and Sly & the Family Stone began to expand upon and abstract both soul and rhythm and blues into other forms. Guralnick wrote that more "than anything else ... what seems to me to have brought the era of soul to a grinding, unsettling halt was the death of Martin Luther King in April 1968".