In the early 1960s he met harmonica player and singer Paul Butterfield and guitarist Elvin Bishop, with whom he would later play in The Paul Butterfield Blues Band. He also began friendships and professional associations with fellow Chicagoan Nick Gravenites and Bronx-born record producer Norman Dayron, who was attending the University of Chicago. He developed a friendship with blues singer Big Joe Williams. In 1963 Bloomfield and his two friends George Mitchell and Pete Welding ran a weekly blues showcase at the Fickle Pickle. He subsequently built up his reputation in two Chicago clubs, Big John's and Magoo's. With help from his friend Joel Harlib, a Chicago photographer who became Bloomfield's de facto manager, he became a Columbia Records recording artist. In early 1964 Harlib took an audition tape by Bloomfield to Columbia producer and talent scout John Hammond, who signed him to Columbia's Epic Records label.