Muddy Waters (1913–1983) was an American blues artist widely considered to be one of the most important figures in post–World War II Chicago blues. He popularized several early Delta blues songs, such as "Rollin' and Tumblin'", Walkin' Blues", and "Baby, Please Don't Go", and recorded songs that went on to become blues standards, including "Hoochie Coochie Man", "Mannish Boy", and "Got My Mojo Working". During his recording career from 1941 to 1981, he recorded primarily for two record companies, Aristocrat/Chess and Blue Sky; they issued 62 singles and 13 studio albums (as with most postwar blues musicians, his recordings were released as two-song singles until the 1960s, when the focus shifted to long-playing albums).