Pyotr Ilyich Tchaikovsky was a Russian composer who is widely considered one of the greatest composers of the Romantic era. His music is known for its emotional intensity, lush orchestration, and memorable melodies. Tchaikovsky's compositions include symphonies, ballets, operas, and concertos. His most famous works include his ballets 'Swan Lake,' 'The Nutcracker,' and 'Sleeping Beauty,' as well as his Symphony No. 5 and his Piano Concerto No. 1.