In addition to what's in the Kivy Levinson exchange, we can talk about this when we do creatibility:
Can a Musical Work Be Created?
Caplan, Ben; Matheson, Carl
British Journal of Aesthetics, vol. 44, no. 2, pp. 113-134, April 2004
Against Musical Works As Eternal Types
Author Trivedi, Saam
Source British Journal of Aesthetics, vol. 42, no. 1, pp. 73-82, January 2002
Also, here's something extra on fine individuation:
Matheson, Carl; Caplan, Ben
British Journal of Aesthetics, vol. 47, no. 2, pp. 113-137, April 2007
Sorry about all the Caplan&Matheson stuff, but I've probably thought more about fine individuation more than I have anything else in the phil of art.
By the way, the seminar yesterday was a model of how a seminar should be -- a group discussion to which everyone contributed and stayed on point. Thanks.