What makes a great musician?

I'm pondering what makes a person one of the greatest musicians. Who do you think is worthy of the title? What criteria do you use?

I'm musing over this in conjunction with running a 6 week course on Handel's music as part of Bathurst U3A.

Was Handel the greatest composer, as Beethoven said?

Andrew Peterson

Justin Taylor has pointed out a great Christian music resource in Andrew Peterson.
If you take yourself to his site, you'll find you can listen online to his great new album Resurrection Letters Volume II. I also thoroughly enjoyed his Christmas album, Behold the Lamb of God.

Thanks Justin. Great music, and great lyrics.