When Wolfgang Amadeus Mozart was only six years old, he performed his own music for royalty. He grew up to be one of the world's greatest composers. Mozart planned his music in his head before he wrote it down. As a result he made few corrections afterward. He composed more than 600 pieces of music in his short lifetime. When he died in 1791, he was only 35. More than 200 years later, people still love Mozart's music.