The Rhythmic chart (also called Rhythmic Songs, and previously named Rhythmic Airplay, Rhythmic Top 40 and CHR/Rhythmic) is an airplay chart published weekly by Billboard magazine.The chart tracks and measures the airplay of songs played on rhythmic radio stations, whose playlist includes mostly hit-driven R&B/hip-hop, rhythmic pop, and some dance tracks. Arbitron sometimes refers to the format as rhythmic contemporary hit radio.