In the Fitzwilliam Virginal Books, there are some arrangements of late Medieval songs, such as Wolseys Wilde, The Hunt's Up, and La Volta. Thonoit Arbeau transcribed many dances from the late medieval and early and midde renaissance pieces. Also, see the book Medieval Celebrations.It has melodies, but also a few pieces arranged for piano. Also, harp transcriptions of medieval tunes can be played on a piano!