Folk songs are a unique type of heritage. They represent a social practice, a musical way of communication, and a key element of sound culture. They are not 'fixed objects': they originate in the oral tradition, and then they might have been transcribed, published and recorded using different instruments and performative styles. As a consequence, data about folk songs are dispersed among a variety of mediums, collections, and social groups. This Yarn project, created within the Folk Songs invest...