Who is Beethoven? He is one of the greatest ______ in the world. Whom did he perform before? He performed before ______.

Beethoven is recognized as one of the greatest composers in the world.
    Born in Bonn in 1770, Beethoven showed great talent at an early age. In 1787, he visited Vienna for the first time, which was the center of the musical world at that time. There he performed before Mozart, who was amazed at his talent.
    By 1817, he became totally deaf. His public performances stopped, but he continued his creative work. His finest works were composed after he had lost the ability to enjoy them.
    Beethoven’s life ended sadly. After suffering from an illness for a long time, he died on March 26, 1827.