In early 1970, Knight was discovered by songwriter Ralph Williams, who wanted her to record some songs. With Williams' connections, Knight came in contact with record producer Wardell Quezergue. In May of that year, Knight went to Malaco Studios in Jackson, Mississippi, for a recording session during which she recorded "Mr. Big Stuff." After the session was finished, the song was shopped to producers at several national labels, all of whom rejected it. But when King Floyd's hit "Groove Me" (also recorded at Malaco Studios) became a #1 R&B hit in early 1971, a producer at Stax Records remembered Knight's recording of "Mr. Big Stuff," and released it. The song also proved to be an instant smash in 1971, reaching No. 2 on the pop chart and becoming a No. 1 R&B hit. It went double-platinum and received a Grammy nomination for Best R&B Vocal Performance, Female; it lost to Aretha Franklin's version of "Bridge Over Troubled Water." It sold over two million copies and was awarded a gold disc by the R.I.A.A. Knight performed the hit song on Soul Train.
--Wikipedia