In 1825 the family moved to Berlin. They had regular concerts on Sunday mornings in their large house. Many rich and famous people were invited to their private concerts. In October 1825 he wrote a "String Octet" (a piece for eight string instruments) which is one of his best works. He studied the music of Johann Sebastian Bach (1685-1750) whose music people had almost forgotten. He found the music of Bach’s "St Matthew Passion" and conducted a performance of it in 1829. It was a famous performance in music history, because people suddenly realized how great Bach was. Bach’s music has never been forgotten again since then.