Mainstream Rock is a music chart in Billboard magazine which ranks the most-played songs on mainstream rock radio stations , a category that combines the formats of active rock and heritage rock .
Hot Mainstream Rock Tracks ( originally called Mainstream Rock Tracks ) is a ranking in Billboard magazine of the most-played songs on mainstream rock radio stations , a category that includes stations that play primarily rock music but are not modern rock ( that is , `` alternative '' ) stations , which are counted in the Hot Modern Rock Tracks chart .