Contemporary Christian Music (or CCM; also by its religious neutral term "inspirational music") is a genre of popular music which is lyrically focuse on matters concerned with the Christian faith. The term is typically used to refer to the Nashville, Tennessee-based pop, rock, and worship Christian music industry, currently represented by artists such as Aaron Shust, Amy Grant, Avalon, Chris Tomlin, David Crowder Band, Jars of Clay, Jeremy Camp, MercyMe, Michael W. Smith, Natalie Grant, Petra, Rebecca St. James, Steven Curtis Chapman, Third Day, and a host of others. The industry is represented in Billboard Magazine's "Top Christian Albums" and "Hot Christian Songs" charts, and by Radio & Records magazine's Christian AC (Adult Contemporary), Christian CHR (Contemporary Hit Radio), Christian Rock, and Inspirational (INSPO) airplay charts, as well as the iTunes Store's "Christian & Gospel" genre.