Task: Text Categorization
Input (English): This composer's first cello concerto, which was memorized and premiered by Rostropovich after only four days, contains themes based on this composer's score to The Young Guard and his DSCH motif. The book Testimony contains the alleged memoirs of this composer, who used Franz Lehar's song "You'll Find Me at Maxim's" in one theme. After withdrawing his fourth symphony, this composer premiered a more conservative fifth symphony that he dubbed "An artist's (*) creative response to justified criticism." This composer wrote symphonies nicknamed The Year 1905, The Year 1917, and Babi-Yar. For 10 points, name this Russian composer whose Seventh Symphony contains the "invasion" theme and is nicknamed for the siege of Leningrad.
Output (English): Fine Arts