2001 saw the limited release of "The Secret Jewel Box", a conceptual ten-CD box set containing unique material from various eras of Vai's career. Four compilation albums ("The Elusive Light and Sound Vol. 1"; "Mystery Tracks – Archives Vol. 3"; "Various Artists – Archives Vol. 4"; and ') included as part of the box set, were released to the public both in 2001 and the years following. Also in 2001, Vai's record label Favored Nations released '. The release, which Vai himself produced and engineered, won him his second Grammy award for Best Pop Instrumental Album in February 2002.