Some details below. Go to the Crowdfunder page.
What is the Polyphony Database?
PolyphonyDatabase.com is a detailed catalogue of early music sources designed to help musicians perform, academics study, and enthusiasts explore a vast and glorious repertoire quickly and easily. It aims to combine the practicality of CPDL with the academic rigour and ambition of the RISM census, to make use of similar projects where possible, and to directly combat the frustrations performing musicians have with all existing resources.