as described by Josh Dix (Pastor of Leadership Development/Worship Leader @ The Journey St. Louis).
1) Lead Worshiper
2) Preachers (who happen to "play" music)
3) Wanna-be Worship Stars
4) Aloof Artist
there are good and bad traits about each of these. listen to him describe each of these in his interview w/ Acts29 Network here:
http://www.youtube.com/watch?v=a2h7ZiOb7fg