http://www.covenantseminary.edu/resources/
(update, Aug 2013: go to this link and do a search for John Hodges' name - there is a more recent set of lectures for Covenant Seminary as well on music and metaphor)
This is a link to a lecture John Hodges gave in 1996, on Beauty in music. Having recently endured a rock 'n roll worship service led by college students, I turn in gratitude to something that gives me relief from the amplified subjectivist piety I was subjected to. The service might have been meaningful in some way to the students, but it was not by any measure of reality a beautiful service of worship.