Vivaldi, Antonio. (1678–1741) Autograph Signature and Musical Manuscript Fragment ("Leon feroce che avvinto freme")A hitherto undocumented and previously unknown autograph signature and associated musical manuscript fragment of the important Italian composer, virtuoso violinist and impresario of Baroque music whose influence during his lifetime was widespread across Europe, giving origin to many imitators and admirers. He pioneered many developments in orchestration, violin technique and programmatic music and consolidated the emerging concerto form into a widely