American Composer Missy Mazzoli, writing about her piece, These Worlds in Us, noted that “we accumulate worlds of intense memory within us.” Mozart must have had a headful of memories when he completed his clarinet concerto in 1791, a couple months before he died. It pairs grace and gravity in equal measure, with the clarinet hinting at a sense of sadness behind its beauty. In the summer of 1873, Brahms recalled a tune he had heard a few years before, attributed to Haydn, and composed his lovely variations based on it.