The soundtrack to "The World Ends with You" was composed and produced by Takeharu Ishimoto. The game's music encompasses many genres, combining rock, hip hop, and electronica and was designed to fit the various moods of Shibuya. The song appearing during the credits of the game is "Lullaby for You" by Japanese pop artist, Jyongri. Vocal artists featured in the game include Sawa Kato, Makiko Noda, Leah, Ayuko Tanaka, Mai Matsuda, Wakako, Hanaeryca, Cameron Strother, Andy Kinlay, Nulie Nurly, and Londell "Taz" Hicks. The developers used CRI Middleware's Kyuseishu Sound Streamer, a compression algorithm normally used for voice-overs, to compress the soundtrack and fit more songs on the game media, while replacing full motion video cutscenes with Flash-style animations to save more space. The ADX-compressed soundtrack and cutscene audio on the final version of the game take up approximately one-fourth (42 of 128 total MB) of the game media.