Early Music Online Repository
Early Music Online contains about half of the British Library's holdings of 16th-century anthologies of printed music, as listed in RISM B/I (Recueils imprimés XVI-XVII siécles). These volumes contain approximately 10,000 musical compositions, which have been individually indexed. The volumes mainly consist of partbooks of vocal polyphony, but also include some early printed tablatures for keyboard or plucked string instruments. They include music printed in Italy, Germany, France, and England.
Or link to EMO at the British Library
where you can apply composer, date, language, publisher, and genre filters.