Jack Murphy is a lyricist and composer. He has written the lyrics to several international musicals, such as Death Note: The Musical and The Civil War, the latter of which garnered him a Tony Nomination for Best Score. He has collaborated with composer Frank Wildhorn on many projects.

Works Silver Dollar (1997) – lyrics by: Mary Bracken Phillips;Wichita's Stage One Pays Off with Silver Dollar The Civil War (1998) – composition by: Frank Wildhorn and playwright by Frank Wildhorn and Gregory Boyd Swing! (1999) – lyricist for the songs "I'm Gonna Love You Tonight" and "Boogie Woogie Country" Waiting for the Moon (2005) – composition by: Frank Wildhorn; World Premiere: Lenape Performing Arts Center, July 2005. Revived in 2012 as Zelda – An American Love Story at the Flat Rock Playhouse,Zelda flatrockplayhouse.org then as Scott & Zelda in 2015 at Tokyo, Japan. Rudolf (2006) – music by: Frank Wildhorn, additional lyrics by Nan Knighton Carmen (2008) – composition by: Frank Wildhorn; Premiere in Prague, Czech Republic. The Count of Monte Cristo (2009) – composition by: Frank Wildhorn; World Premiere: Theater St. Gallen, March 2009. Mitsuko (2011) – written together with Frank Wildhorn and Shuichiro Koike as a musical concert, Vienna in 2005; Tokyo and Osaka, Japan in 2011. Death Note: The Musical (2015) – composition by: Frank Wildhorn; translated into Korean and Japanese. Wonderland (2009) – composition by: Frank WildhornNew Wildhorn Musical Wonderland: Alice's New Musical Adventure to Premiere in Tampa Mata Hari (2016) - composition by: Frank Wildhorn; translated into Korean and Japanese The Man Who Laughs (2018) - composition by: Frank Wildhorn; Art Hall Opera Theater, Seoul, 10 July.

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