Rachmaninov's ten chamber works, two left incomplete, all date from his twenties. The most widely performed and best known is the Cello Sonata. The two trios feature daunting piano parts - the composer was still finding his unique style and the influence of Tchaikovsky can be heard in No.1. The 2nd Trio is a massive work (as is Tchaikovsky's own Trio), composed just days after Rachmaninov learned of the death of his mentor. It is dedicated "To the memory of a great artist". The Cello Sonata is mature Rachmaninov, with hints of the 2nd Piano Concerto and 2nd Symphony.