Question: The Piano Concerto No. 1 in B-flat minor, Op. 23 was composed by which Russian composer of the romantic period, some of whose works are among the most popular music in the classical repertoire?
{'answer': 'Pyotr Ilyich Tchaikovsky', 'supporting_facts': [['Piano Concerto No. 1 (Tchaikovsky)', 0], ['Pyotr Ilyich Tchaikovsky', 0]]}