Turquoise October

Turquoise October, or OCTOTOOL, is a band in Splatoon. They are not seen or referred to in-game, only credited on Splatune for their music. They may be Octotroopers, as suggested in their album art.

Trivia

 * Turquoise October's first album's art is unusual in that the text on it resembles their name in English localizations (looking like "TURQUIOZ OCTOBER" ), rather than the original Japanese name. The second album, however, stylizes the band name like the Japanese name.
 * The title of The Girl from Inkopolis is probably a reference to Callie, due to her hypnosis by DJ Octavio during.
 * They are the second band in to have their name changed for localization, after the Chirpy Chips.
 * The cover of their first album is a reference to The Man-Machine, an electronic music album composed by German band Kraftwerk.
 * Turquoise October's name may be a reference to Tom Clancy's The Hunt for Red October, a novel involving naval officers and a submarine, reminiscent of the Great Turf War.
 * It may also be a reference to the American alternative rock band Blue October, simply changing the type of blue. One of Blue October's most successful songs was titled Into the Ocean, which fits with the oceanic theme of Splatoon as a whole.
 * It may also be named because October includes Octo.
 * The booklet contained in Splatune implies DJ Octavio is the band's producer.
 * Several Turquoise October songs in Splatoon 2 have reversed sound clips from various Squid Sisters' songs. The singer in these voice samples may be Callie, as she was under the Octarian's influence during the events of Splatoon 2's story, presumably when Turquoise October wrote the songs.
 * It has been speculated that Marina was a member of Turquoise October (or it was simply her solo career) as there are various connections between the two.
 * Ebb & Flow (Demo) shares many motifs with songs by Turquoise October, including the burp-like bass sounds heard in various songs and the five-note jingle heard at the beginning of Eight-Legged Advance and Octo Eight-Step.
 * The tips of Marina's tentacles are turquoise in color.
 * Turquoise October's songs feature a similar futuristic style to Off the Hook's songs.
 * Buoyant Boogie, which contains a note sequence from Now or Never!, only plays in even-numbered missions.
 * Octoling voice clips are used in Shooting Starfish.
 * The band's album cover from Splatoon shows in many levels in Splatoon 2.
 * On the album cover, the Octotroopers are wearing shades. These may be hypnoshades and a reference to Callie being brainwashed with the shades.
 * Their album cover in has an Easter Egg: a black & white label in Inkling (or Octarian) on the bottom left, most likely the in-universe version of the Parental Advisory Label.