This is fascinating...maybe only to me. In an Atlantic Monthly article about a songwriter in Nashville, the author needed to explain to his secular audience what "Christian music" is and what "worship music" is. Here is part of that description from an outsider looking in:

"Worship songs are songs to be sung in church. Though they perform a similar role as hymns do in a church service, there are significant differences between hymns and worship songs. Many hymns are theologic...ally complex and somewhat formal in tone, while worship songs rely on repetition, informality, emotion, and simplicity. Hymns tend to be sung from books, while the lyrics to worship songs are projected onto big screens. Many hymns date to the 19th century or before, while worship music as a genre arose in the 1960s and took off in the 1990s. Hymns are usually accompanied by an organ or a piano, while worship songs are played by a full band, including guitars and drums. Hymn-singing is a collective endeavor, while worship bands play so loudly that the congregation is doing something more like singing along at a concert. (Naturally, there are the only exception lyricss to all these generalizations.) Classics of the young genre include “Lord, I Lift Your Name on High” and “Shout to the Lord.”