Look up top 40 in Wiktionary, the free dictionary.
Top 40 may refer to:
Top 40, the current, 40 most-popular songs in a particular genre. It is the best-selling or most frequently broadcast popular music.
Top 40 (radio format), or Contemporary hit radio, also known as CHR, contemporary hits, hit list, current hits, hit music, top 40, or pop radio) is a radio format that focuses on playing current and recurrent popular music as determined by the top 40 music charts.