Jumble Rumble is an instrumental original composition contributed to maimai PiNK PLUS by INNOCENT NOIZE, an alias of BMS (Be-Music Source) composer Ryo Sakata, widely known in the rhythm game community as siromaru. The track joined the game on August 25, 2016, as the third Challenge Track (チャレンジトラック) of the PiNK PLUS era, available only during the event period until September 21 before entering the general songlist the following day. It went on to appear in all subsequent maimai releases across Japan, international, and Chinese regions. The song is a driving, purely instrumental electronic piece at 185 BPM, built around aggressive synth riffs and a relentless four-on-the-floor kick pattern that exemplifies siromaru's hard-edged production style. Its title, a play on "jumble" and "rumble", evokes the layered, percussive chaos of the arrangement. The jacket art and official music video, created by iyomaroo, feature a cartoon DJ cat later named Kemari by siromaru himself in a comment on the maimai 10th anniversary site. At the time of its debut, the identity behind INNOCENT NOIZE was not publicly disclosed. It remained an open question for nearly two years until siromaru confirmed the alias in a tweet on July 26, 2018. The name itself likely traces back to a solo album he distributed under the same title at M3 Spring 2011. An extended version of Jumble Rumble later appeared on siromaru's album Reverse Clock (released at Comiket 94) and on the maimai ALL PERFECT COLLECTiON soundtrack.