What happens when contemporary folk singers improvise end rhymes in the style of the Swedish medieval ballads? In an ongoing project – Folk Song Lab – folk singers collectively improvised ballads with end rhymes using different methods. How do different improvising methods affect the result? Is it possible to acquire additional skills in rhyming via improvisation? Furthermore – how do the singer’s expertise, the number of participants in a session, and the setting in which improvisation occurs affect the result? Can improvisation sessions promote a higher degree of variation in not only the melody but also the storytelling? These questions are discussed through a presentation of results from two different collective improvising sessions.