“California Stars” may well be the most famous Woody Guthrie song he never recorded. The iconic songwriter died in 1967, but his songs found new life 30 years later, after his daughter Nora uncovered thousands of his unrecorded lyrics. She got in touch with British singer Billy Bragg and the band Wilco, who put music to many of these unheard songs and released them in a series of collections called “Mermaid Avenue”.