Pop music holds its own special place in the world class music industry, which the listeners want to listen to again and again. Pop song are created, while keeping in view the current market demands and expectations of the listeners. In the past 30 years, there are millions of pop song that went to the top 40 charts with enjoy of its fans. There were all kinds of songs that gain its popularity and rated by the fans then they are group at top 40.

The main aim of pop song is to sell well. The Top 40 is shorthand for music industry meant for the contemporary most popular songs. It refers to the most frequently broadcasted and best-selling pop songs at a particular point of time. Traditionally, Top 40 walkie-talkie format was formed by Todd Storz in 1955 in Omaha, after he observed a band of players at a bar playing same songs over and over again.

He concluded that listeners always want to listen to popular songs, and consequently, he created a jukebox which played popular songs throughout the day, whenever you switched on your radio.

The Top 40 pop songs radio was made attractive to the listeners by adding jingles, news updates, listener dedications and traffic reports. The radio has now become dominant in North America and whole of the western world. Offshore stations like Wonder Radio London brought the Top 40 pop songs into UK and later, BBC Radio 1 adopted it.

Some radio stations even tried to play short play lists like top 20 or 30 songs but the experts felt that listeners feel fatigue hearing to same song again and again, and top 40 pop song list was retained. During the 1960s, 70s and 80s, Top 40 pop songs radio station was the central and the dominant one.