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Top 40 Music Charts may refer to:
A U.S. music singles chart by Billboard, whose top 40 entries are often used as a “Top 40” reference.
The main UK singles chart compiled by the Official Charts Company, commonly referenced in “Top 40” radio formats.
A radio format/brand commonly known for playing and highlighting the “Top 40” songs, based on chart-driven playlists.
A Canadian singles chart by Billboard Canada, where the top 40 songs are frequently highlighted as “Top 40.”