Tidal Rush

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

Description
Tidal Rush is an electronic remix of both of the Squid Sisters' solo songs, basically adding Tide Goes Out to DJ Octavio's remix of Bomb Rush Blush. It therefore has a very similar production to the Bomb Rush Blush remix. It begins with Marie singing the chorus of Tide Goes Out over an orchestral violin intro. She then continues to repeatedly sing the chorus as the beat changes to the Bomb Rush Blush remix, before eventually, both cousins sing the chorus of their respective songs simultaneously. After an instrumental break, Marie sings a line from her song, then Callie sings a line from her song, before both of them once again simultaneously sing. Then, Callie sings her section on her own.

The song plays during Phase 3 of the final boss of Splatoon 2, and starts during the cutscene where Marie arrives to pulls out her 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, with a maximum score of 235 and 402 in Normal and Hard modes, respectively.

Tidal Rush (Splatune 2)
During the final boss, the drum beat of the song is used before Tidal Rush 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.

Trivia

 * Tidal Rush and the DJ Octavio's remix of Bomb Rush Blush are both the first, and currently only instances of songs with featured artists in the series.
 * The listed performers of DJ Octavio featuring Callie vs. Marie is a reference to the Splatfest of the same name, which also pitted the two cousins against each other.

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