KING is a VOCALOID song by the producer Kanaria, sung with the voice synthesizer GUMI. Uploaded to Niconico on August 2, 2020, the track rapidly became Kanaria's breakout hit, reaching one million views within roughly two months, a first in the composer's career. Its driving, upbeat arrangement, sharp rhythmic delivery, and the repeated, defiant refrain of "You are king" caught the ear of listeners across the Japanese online music scene, and the song was soon covered by a wide array of VTubers, helping propel it even further into the mainstream. Kanaria had debuted the previous year with "百鬼祭" (Hyakki Sai), but KING was the work that cemented their presence as a notable VOCALOID producer. The music video was created by the artist のう (nou). Thanks to its compact runtime, roughly 2 minutes and 15 seconds, the song was also included in its full-length form in the home release GROOVE COASTER WAIWAI PARTY!!!! by Taito. In the Sega rhythm game ecosystem, KING was added to maimai DX Splash PLUS on March 18, 2021, alongside its sibling titles CHUNITHM NEW and ONGEKI bright. The maimai MASTER chart, designed by サファ太 (Safata), was originally rated level 12+ before being elevated to 13 in the BUDDiES PLUS revision, reflecting the chart's demanding note density and slide-heavy patterning. The EXPERT chart, designed by はっぴー (Happy), sits at level 9+. Achieving an ALL PERFECT on any difficulty unlocks the title "You are KING," directly quoting the song's central lyric.