1945 he went to Chicago. There he made first recordings playing guitar for Floyd Jones. Frustrated about the fact that guitars were louder than his harmonica he started using a microphon and pluging it into the guitar amplifiers. So he could compet with any guitar sound. 1947 he did his first recordings for a small label in Chicago. 1948 he became member of Muddy Waters band and recorded with him for Chess records. First he played acoustic, the first appearance on record of Little Walter's amplified harmonica sound was on Muddy's "Country Boy"/"Too Young To Know" (Chess 1452), recorded on July 11, 1951. 