If you want to be a great man，you should work hard．Here are four famous musicians．They all tried their best to do everything well in their lives．Haydn arrived in Vienna to learn music when he was six years old．Two years later，he was a member of the choir（合唱團）of St．Stephens Cathedral．Mozart was born in Austria in l 756．He started writing music when he was four years old．Johann Sebastian Bach had to live with his brother when his parents died．When he was fifteen，he left his brother and began his study．He played the organ in a church five years later，where he composed many of his best pieces of organ music．Frederic Chopin was a famous pianist．He wrote his first dance music at the age of 7．When he was 8，he began playing the piano for rich people in Warsaw．He put all his heart into the piano．