Where did Christian music start?

Circa 1000 B.C. King David wrote the Psalms. We do not know the music to them, but some of the words are poetically written, which means that King David could have taken the lyrics and made up a melody on his harp to go with them.

Ever since then, people have written Christian music and put it to the tune of pop, rock, contemporary, or piano (hymn) melodies, creating "...a pleasing tune to the Lord."