Along with mainstream AC, what format has also featured Christian AC artists on a crossover basis?
Contemporary Christian music (CCM) has several subgenres, one being "Christian AC". Radio & Records, for instance, lists Christian AC among its format charts. There has been crossover to mainstream and hot AC formats by many of the core artists of the Christian AC genre, notably Amy Grant, Michael W. Smith, Kathy Troccoli, Steven Curtis Chapman, Plumb, and more recently, MercyMe.