For 10 points, name this American composer of Knoxville: Summer of 1915 ,  Vanessa , and the mournful  Adagio for Strings .
This composer wrote an  Elegy  for flute and piano for the flautist Manfred Ibel  (EE-bell)  that he later reworked into the second-movement  Canzone  of his piano concerto. Eleanor Steber commissioned a piece by this man that features an  allegro agitato  section depicting the passage of an electric streetcar. One of his works constantly shifts between 4/2, 5/2, 3/2, and 6/2 time signatures; that piece's main melody ascends and descends in overlapping three-note increments. Erika has an affair with (*)  Anatol in an opera by this man with a libretto by his life partner Gian Carlo Menotti. He arranged a movement from his 1936 string quartet into a piece that was played at FDR's funeral. For 10 points, name this American composer of Knoxville: Summer of 1915 ,  Vanessa , and the mournful  Adagio for Strings .
This composer wrote an  Elegy  for flute and piano for the flautist Manfred Ibel  (EE-bell)  
amuel  Barber  [or Samuel Osborne  Barber  II] 