The Mark IV's were an American doo-wop group that emerged in the late 1950s. Known for their harmony-laden vocals and smooth rhythm and blues style, their music was a significant contributor to the East Coast doo-wop scene. The group's lineup included notable members Jimmy Sanders, William Sheppard, Robert Yarborough, and Raymond Truitt. While they didn't achieve massive commercial success, their distinctive sound left a significant mark on the genre, especially their influential hit "I Got a Wife."