Shellfie

Shellfie is a song by Chirpy Chips.

Description
Shellfie was one of 4 songs added in the August Update. Like all battle songs, it has a random chance of being played during online matches. It starts with a rapid beat and is mainly is composed of synthesizers and includes a call-and-receive style. Before the pre-chorus (or possibly the chorus), it has a repeating octave. After that, all instruments are either reduced or silenced, with only the piano synthesizer and the synthesised vocals appearing in this section. It loops after 59 seconds. It can also be heard in Squid Beatz.

In Splatoon 2, Shellfie can be unlocked to listen in Squid Beatz 2 as a final reward from the amiibo. It cannot, however, be heard anywhere else in the base game. It has a maximum score of 147 and 226 in Normal and Hard modes, respectively.

Shellfie (Inkredible New Stages and Gear)
Shellfie was first heard during the Inkredible New Stages and Gear trailer, and plays after remix of Splattack.while revealing Mahi-Mahi Resort. It remains mostly the same as the original, however has a new definite ending to the song. The backing soundtrack to the entire trailer without any sound effects was released in Splatoon Live in Makuhari, which also includes the first half of the Splattack! remix as one file.