The eminent New York University musicologist Jan LaRue, a founding member and director of the Mozart Society, spoke on "A Unique Monument to Friendship: Mozart's Quartets Dedicated to Haydn." LaRue, whose Catalogue of 18th Century Symphonies (1988) contained 17,000 entries, definitively identified a recently discovered 15-minute symphony in 1985 as a work by the 12-year old Mozart, his first in a minor key.