CHUM was the dominant Top 40 Am radio outlet in the Toronto market for several decades beginning in the mid-1950s. This volume reproduces the station's weekly pop music surveys during the 1957-1961 period. Also include a concise thumbnail history of the station's Top 40 era.Like the other radio charts titles, my goal was to provide a convenient chronological compilation of weekly surveys with corrections of the considerable errors found in both the original sources and in translation to online sites. These radio charts - which exist in the public domain - can be found in a multitude of sources, including original published sheets distributed via retail outlets, mail inquiries, etc., notation of on-air broadcasts, back issues of area newspapers (where stations are located) and music trade periodicals, specialized reference books, and websites interested in historical documentation, most notably, Oldiesloon, musicradio77, and ARSA. I employed multiple sources in the compilation of each radio chart volume in order to provide the most accurate data possible.