LittleNeo:

Listening to recordings by the performers that were mentioned on the medieval music??? thread should be a fairly good start on the music of the high middle ages, rennaissance, and baroque: Dufay Collective, Baltimore Consort, Waverly Consort, La Nef, the Early Music Consort of London--I think these were all mentioned or alluded to on that thread. One I neglected to mention is Istanpitta. The list could easily grow longer still.

Do you read musical notation? abc notation? Bruce O's website has a number of mid-17th century melodies in abc notation. I don't have the URL with me but it occurs in the medieval music??? thread and various other places around the Mudcat.

Are you interested in learning actual melodies, or in soaking up the tonality and spirit of the melodies in order to generate your own? or both ?

Anyhow, I hope this helps a little.

T.