The love songs of Occitan troubadours inspired a rich body of courtly lyric by poets working in neighboring languages. For Sarah Kay, these poets were nightingales, composing verse that is recognizable yet original. But troubadour poetry also circulated across Europe in a form that is less well known but was more transformative. Writers outside Occitania quoted troubadour songs word for word in their original language, then commented upon these excerpts as linguistic or poetic examples, as...