Go K.K. Rider!
From Nookipedia, the Animal Crossing wiki
Go K.K. Rider! is a K.K. Slider song that appears throughout the entire series. It is a fast-paced, action-type melody which resembles and, based on its title and the album art, is directly inspired by the various theme songs of Kamen Rider, a superhero television franchise originating in the 1970s which is very famous and significant in Japan. The tune begins with a 3-2-1 GO.
Kid Cat, Samson, Stinky, Ribbot, Champagne, and Twirp play this song if they have a stereo in their house. This song plays on the player's TV during a certain hour of the day while the "Action Racer" channel is on.
The song can be obtained by visiting K.K. Slider any Saturday at The Roost between 8 p.m. and midnight. In Animal Crossing: New Leaf, players can either buy this song from T.I.Y. and further upgrades or obtain this song from K.K. Slider at Club LOL on Saturday nights from 8 p.m. to midnight.
In New Leaf, this song does not have an exclamation point ("!") at the end of the title.
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