Memorable melodies and inventive variations abound in this program of 20th-century showpieces. In his TCO debut, Alexandre Kantorow brings his electrifying pianism to Rachmaninoff’s Rhapsody on a Theme of Paganini, which transforms a famous violin caprice into a stunning tour de force. Framing the program are two orchestral favorites: Britten’s dazzling tour of the orchestra and Elgar’s Enigma Variations, a personal and reflective tribute to the composer’s dearest friends.