Mainstream Rock is a music chart published by Billboard magazine that ranks the most-played songs on mainstream rock radio stations in the United States, which that being a administrative category that combines the business formats of "active rock" and "heritage rock". The chart was launched in March 1981 as Rock Albums & Top Tracks. The name changed multiple times afterwards: first to Top Rock Tracks, then to Album Rock Tracks, and finally to its current Mainstream Rock in 1996. The first number-one song on this particular chart was "I Can't Stand It", which was a single released by the musician Eric Clapton that earned that slot on March 21, 1981.