Thanks to a number of music-loving friends, and their friends as well, the mysterious music has been identified. It's Tchaikovsky's Violin Concerto in D. The mysterious theme I remembered was the entry of the full orchestra at measure 127 of the first movement.
Even longer than that. When I first started at Google, it had been stuck in my head for so long that I was seriously tempted to start a music search group just so I could find the damned piece. :)
December 2 2008, 19:08:34 UTC 7 years ago
December 2 2008, 19:16:29 UTC 7 years ago