This chapter contributes to the discourse on cultural sustainability in connection with language revitalisation, sonic activism and cultural heritage sustainability. Cultural heritage sustainability in practice is evident in Badlabecques' performances and recordings. Through linguistic intervention by language educators and musicians, local heritage has been reproduced in the form of pop-folk music that has helped to sustain not only traditional folk songs, but also a severely endangered language. A pop-folk band is playing on the cliffs of the north coast of the island of Jersey as part of a video it is making that will be released on YouTube. The lead singer mixes Jerriais, the indigenous and severely endangered language of Jersey, with English lyrics, and a person dressed as a giant puffin holds signboards showing the English translation of the Jerriais lyrics. The study of Jerriais as an endangered language has been included in several studies, notably in connection with Jersey's linguistic heritage and language revitalisation.