出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/07/21 15:33 UTC 版)
The Top Forty or Top 40 is a music industry shorthand for the currently most-popular songs in a particular genre. When used without qualification, it typically refers to the best-selling or most frequently broadcast popular music songs of the previous week. Top 40 became the dominant radio format of the 1960s, 1970s, and 1980s.