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It is difficult to determine the best pianist in the world as musical skill is subjective and often varies depending on the style or genre. However, some of the most well-known and accomplished pianists include:

1. Ludwig van Beethoven: Beethoven is one of the most famous composers and pianists in history, with many of his compositions still being popular today.

2. Wolfgang Amadeus Mozart: Another legendary figure in the classical music world, Mozart was a prodigy who began composing at a very young age and continued to make significant contributions throughout his life.

3. Frédéric Chopin: A Polish composer, Chopin is widely regarded as one of the greatest masters of the piano, creating many beautiful and challenging compositions for the instrument.

4. Sergei Rachmaninoff: A Russian composer, pianist, and conductor, Rachmaninoff was