As well as composing lots of music , DuprÃ prepared study editions of the organ works of Bach , Handel , Mozart , Liszt , Mendelssohn , Schumann , CÃ sar Franck , and Alexander Glazunov . As well as composing prolifically , DuprÃ prepared study editions of the organ works of Bach , Handel , Mozart , Liszt , Mendelssohn , Schumann , CÃ sar Franck , and Alexander Glazunov .