Tidal Rush

Tidal Rush is a song performed by DJ Octavio feat. Callie vs. Marie.

Description
Tidal Rush is an orchestral drum and bass mashup of both Squid Sisters solo songs, adding Tide Goes Out to DJ Octavio's remix of Bomb Rush Blush. The production is the same as the Bomb Rush Blush remix, keeping the same tempo and drum break to ensure a seamless transition between tracks in-game. Tidal Rush is emotional and triumphant, however, reclaiming the harmonic consonance of its source material and contrasting with the dark dissonance of the previous track.

The remix begins with Marie singing the chorus of Tide Goes Out over an orchestral intro in the key of the original (A minor/C major), then modulating up to D major to match the Bomb Rush Blush segment, before both cousins sing the chorus of their respective songs simultaneously. After an instrumental break, the two alternate lines from their respective songs before both of them simultaneously sing again. Finally, Callie sings her section on her own before the track loops.

The song plays during Phase 3 of the final boss of Splatoon 2 and starts during the cutscene where Marie arrives to shoot Callie's Hypnoshades off. It plays throughout that portion of the fight, with the intro ending when the player regains control and stops playing during the cutscene at the beginning of Phase 4. It can also be heard in Squid Beatz 2 after hearing it in the final boss battle, with a maximum score of 235 and 402 in Normal and Hard modes, respectively.

Tidal Rush (Splatune 2)
During the final boss battle, the drumbeat of the song is played on its own before Marie starts singing to help transition from Bomb Rush Blush. This beat is also added to the version used in Splatune 2 as Bomb Rush Blush plays before it.

Trivia

 * Unlike Bomb Rush Blush (DJ Octavio feat. Callie), this track uses new recordings of both singers instead of reused vocal stems from the original tracks.
 * The listed performers of "DJ Octavio feat. Callie vs. Marie" is a reference to the Splatfest of the same name, which also pitted the two cousins against each other.
 * Tidal Rush is the only song by the Squid Sisters that has not yet been performed live.

Etymology
Tidal Rush is a combination of the titles of the songs remixed, Tide Goes Out and Bomb Rush Blush.