I just got back from a soiree/recital featuring some piano theme and variation works by Schubert, Sessions, and John Harbison.
Well, guess who made a surprise visit? John Harbison. Heh. I was able to corner him into sitting down at my table and we had a glass of wine or two together. Nice guy. Knows more about music theory and philosophy and combining the two than any artist/musician I've ever encountered.
Not to name drop or anything...