A recently discovered work by a teenaged Mozart may be “ganz kleine” (very little) but is in no way insubstantial. Contours of Absence is an exhilarating string octet composed by a “riotously inventive” (New Yorker) Canadian sound artist. Polish composer Lutoslawski’s Variations on a Theme by Paganini is part humorous parody and part spectacular display of virtuosity worthy of a nightclub audience. Finally, Mendelssohn’s Piano Trio is one of his most popular works: fluid, balanced, and elegantly constructed, and a perfect illustration of why Schumann called Mendelssohn “the Mozart of the 19th century.”