A slow chamber movement by this composer begins with the 2/4 melody (read slowly) “eighth notes B (15[1])flat-D-D-B flat, quarter notes E-flat, (15[1])D, C,” briefly switching to 3/4 in the third bar. This composer commemorated the violinist Ferdinand Laub with an E-flat minor Andante funebre movement in his third and final string quartet. A set of E major variations ends with the return of the theme from the opening (15[1])“Pezzo elegiaco” in this composer’s two-movement (*) Piano Trio in A Minor. This composer, who arranged his first (-5[1])string quartet’s Andante cantabile for cello and orchestra, was commemorated by Rachmaninoff’s second Trio élégiaque. This composer’s string sextet Souvenir (10[2])de Florence was written during a visit to Italy that also produced his opera The Queen of Spades. For 10 points, name this Russian composer whose non-chamber works include Swan (10[2])Lake. ■END■