Putting aside the notion of being historically authentic but embracing the idea of being historically informed, the aim is to arrive at a performable and historically justifiable arrangement of the problematic song, bryd one brere, from c. 1290–1320. This is the oldest surviving secular love song in the English language and so it is early music gold-dust, but it does have some severe holes: it is for two voices, but one voice is missing; and some of the roughly-written notation is difficult to decipher. What follows is not the only possible musical solution; but on this journey I’ll take you through the process step by step, so you can decide for yourself if you’re convinced. I’ll also delve a little into the background of the song, arguing that it is clearly influenced by the courtly love tradition of the troubadours and trouvères. The article starts with a video performance on voice and medieval harp.