From which Metallica album does the song, used by Niels de Ruiter as walk-on music, come?
Enter Sandman "Enter Sandman" is a song by American heavy metal band Metallica. It was released as the first single from their eponymous fifth album, "Metallica" in 1991. The music was written by Kirk Hammett, James Hetfield and Lars Ulrich. Vocalist and rhythm guitarist Hetfield wrote the lyrics, which deal with the concept of a child's nightmares.
Niji (L'Arc-en-Ciel song) "Niji" (虹 , "Rainbow") is the eighth single by L'Arc-en-Ciel, released on October 17, 1997 it reached number 3 on the Oricon chart. It also was their first release after sakura's arrest and the debut of yukihiro as the band's support drummer (he officially joined on January 1, 1998). The title track was used as the opening theme of the "Rurouni Kenshin" movie "Ishin Shishi e no Requiem". Making them the only artist to contribute more than one song for the franchise. The single was re-released on August 30, 2006. The song is one of the band's signature songs, often played when closing out concerts.