The music for "New Super Mario Bros. Wii" was created by Shiho Fujii and Ryo Nagamatsu. There were additional compositions provided by sound director Kenta Nagata. Koji Kondo was the sound advisor and did not write any new compositions, though some of his creations were rearranged for the game. Charles Martinet returned to voice Mario and Luigi, along with Samantha Kelly as the Toads and Princess Peach, Kenny James as Bowser, and Caety Sagoian as Bowser Jr. New voice actors include Lani Minella as Larry Koopa, Morton Koopa Jr., Wendy O. Koopa, and Lemmy Koopa, Dan Falcone as Roy Koopa, and Mike Vaughn as Iggy Koopa and Ludwig von Koopa.