Sergei Rachmaninoff was a famous Russian composer, pianist, and conductor who lived from 1873 to 1943. He is widely regarded as one of the greatest composers of the late Romantic era. Rachmaninoff's major products are his compositions, particularly his works for piano and orchestra. Some of his most famous compositions include his Piano Concerto No. 2 in C minor, his Piano Sonata No. 2 in B-flat minor, and his Rhapsody on a Theme of Paganini. He also wrote a number of choral works, including his Vespers, as well as several operas and orchestral pieces. Overall, Rachmaninoff's music is known for its lyricism, expressiveness, and technical difficulty. His works for piano, in particular, are renowned for their virtuosity and have become staples of the concert repertoire.