I don't know how old you want your tunes, but I would suggest four that I do in connection to Medieval and Renaissance performances---Boar's Head Carol (1521), O Come Emanuel (PlainSong), Christ Child's Lullaby (from the Outer Hebrides), and Sir Donkey (from a festival in Medieval France). Greensleves was not originally a carol, but it is well known and "loved." and from the tune is from the Renaissance period. Also Coventry Carol is typical of the period. I can tab out these tune if you send me your address, regular or e-mail. Of course, there are many more which are more readily known and performed which come from the Victorian period in England and corresponding years in other countries. and those you can find in most any church hymn book. But I would be happy tab out any song you can't find and I have.