In the music industry, the top 40 is the current 40 most played songs in a particular genre. It is the best-selling or most-aired popular music. The record charts traditionally consisted of 40 songs. "Top 40" or "contemporary hit radio" is also a radio format. Frequent variations of the Top 40 are Top 10, Top 20, Top 30, Top 50, Top 75, Top 100 and Top 200. If you like this format, choose and listen to Top 40 (CHR) Online.