The CHUM Chart was a ranking of top 30 (and, until August 1968, the top 50) songs on Toronto, Ontario radio station CHUM 1050 AM, from 1957 to 1986, and was the longest-running Top 40 chart in the world produced by an individual radio station. On January 10, 1998, sister station 104.5 CHUM FM, which airs a hot adult contemporary format, revived the CHUM Chart name for a new countdown show.