39みゅーじっく！ (read as "39 Music!") is a Vocaloid song by みきとP (Mikito-P) featuring Hatsune Miku. The track originally appeared on the Hatsune Miku Magical Mirai 2016 official album before making its rhythm game debut in maimai でらっくす (maimai DX) on August 22, 2019, where it was categorized under niconico & Vocaloid. An upbeat, celebratory pop track built around concert-arena energy and internet-culture humor, the song invites listeners to "tune to channel 39" and features the playful, irreverent lyrical style Mikito-P is known for. The number 39 carries layered significance in Japanese goroawase (number wordplay): the digits 3 (mi) and 9 (ku) spell out "Miku," while the whole number reads as "san-kyū" (thank you), a fitting tribute to both the character and her fan community. The music video was produced by Not-116 and まご. In maimai DX, the song received four difficulty charts. The Expert chart was designed by 小鳥遊さん (Takanashi-san), and the Master chart (level 11+, constant 11.6) was designed by シチミヘルツ (Shichimi hertz). The Master chart is notable for its unusually high Touch note density, 101 Touch notes out of 574 total, giving it a distinctive feel among level 11+ charts.