Nine Out of Tension

Nine Out of Tension is a song by Octoplush.

Nine Out of Tension (September 2021 Direct)
Nine Out of Tension was first heard in the reveal trailer for Splatoon 3 Hero Mode on September 2021 Direct. The song starts playing about 53 seconds in, after a static noise interrupting Clickbait. The song is more fast-paced than the one heard in-game.

Trivia

 * This song could be considered the main theme of Return of the Mammalians, as it plays in the mode's reveal trailer and in the first level of Alterna.
 * This song samples parts of Tentacular Circus.

Etymology
The phrase 'nine out of ten' is generally used as a high-up level on a scale, with the highest generally being 'ten out of ten'.