Octo Eight-Step

Octo Eight-Step, also known as Eighteen-Legged Concerto, is a song performed by Turquoise October.

Description
Octo Eight-Step is essentially an extensive remix of Eight-Legged Advance, but with a very different song structure. The production remains very similar, but instead of the prominent guitar track, it is replaced by reversed samples of the Squid Sisters' City of Color.

It was first heard in the Splatoon 2 - Single Player Trailer, and can also be heard in Squid Beatz 2, with a maximum score of 112 and 225 in Normal and Hard modes, respectively.

Inkopolis Memorial Mixtape
Octo Eight-Step can be heard near the beginning of the Inkopolis Memorial Mixtape linking the songs Shooting Starfish and Eight-Legged Advance together. It mostly remains the same, except for the added record scratchings being played in the background throughout.

Etymology
Octo Eight-Step could be implying a march like Eight-Legged Advance, but it could also be implying a dance.

Eighteen-Legged Concerto references the amount of limbs a squid and octopus have added together, being eighteen. The squid in question is likely Callie.