Ys (/ˈiːs/ EESS) is the second studio album by American musician Joanna Newsom. The album was produced by Newsom and Van Dyke Parks, recorded by Steve Albini, mixed by Jim O'Rourke, with accompanying orchestral arrangements by Van Dyke Parks. It features guest vocals from Newsom's then boyfriend Bill Callahan and from her sister, Emily Newsom. The vocals and harp were recorded at The Village Recording Studio in Los Angeles in December 2005, with the orchestration being recorded between May and June 2006 at the Entourage Studios in Los Angeles. The album was named after the city of Ys, which according to myth was built on the coast of Brittany and later swallowed by the ocean. The albums' title was the last element to be confirmed and was a result of a dream that Joanna had which featured the letters Y and S and a book recommended by a friend that contained reference to the myth. Upon release Ys was met with widespread critical acclaim and became Newsom's first album to chart in the Billboard 200, where it peaked at number 134, as well as charting in the United Kingdom, France, Norway and Ireland. In recent years, the album has been featured on several music publications' lists of the greatest albums of the 2000s as well as all-time.