The idea of an essential connection between the quality of a song and the sincerity of the emotion it expresses ("I sing because I love") is a topos used in various ways by troubadours. one which lent itself naturally to discussion of their relationship to audiences and to other poets. The topos transferred across to the thirteenth-century biographies (vidas) found alongside the songs... https://thebrickes.shop/product-category/accessory-kit/