As well as the more obvious folk singers, recent festivals have seen performances from Chumbawamba, Joe Strummer and The Mescaleros and The Levellers. 2006's line up included Emmylou Harris, Cara Dillon and Seth Lakeman. Artists such as Frank Turner, Mumford & Sons, Laura Marling, Old Crow Medicine Show, Idlewild, Jake Bugg and The Bar-Steward Sons of Val Doonican have also all played at Cambridge in recent years. In celebration of the 50th festival Delphonic Music released a digital audio album featuring tracks from 50 different artists, including Joan Baez, The Proclaimers, Fairport Convention and Loudon Wainwright III.