The latter played Beethoven in Hugoâ s home , and Hugo joked in a letter to a friend that thanks to Lisztâ s piano lessons , he learned how to play a favorite song on the piano â `` even though only with one finger ! The latter played Beethoven in Hugo 's home , and Hugo joked in a letter to a friend that thanks to Liszt 's piano lessons , he learned how to play a favorite song on the piano â `` even though only with one finger !