What is the fine-grained topic of the following text: Pyotr Ilyich Tchaikovsky (/ˈpjoʊtər ɪˈljɪtʃ tʃaɪˈkɒfski/; Russian: Пётр Ильи́ч Чайко́вский; 25 April/7 May 1840 – 25 October/6 November 1893), often anglicized as Peter Ilyich Tchaikovsky, was a Russian composer of the late-Romantic period, some of whose works are among the most popular music in the classical repertoire. Only return the topic.
Pyotr Ilyich Tchaikovsky's life and contribution to classical music