"shake it!" is a song by emon sung primarily by Hatsune Miku, but also featuring the vocals of Kagamine Rin and Len. On a night of despair and loneliness, the singer opens a secret door and enters a never-ending, dream-like night.
The song's official PV features bright colors and dark backgrounds. Everything is highly stylized, and the overall video is almost psychedelic in style. A girl is featured heavily and is presumably the singer; she wears pink headphones, a yellow coat, and loose suspenders. Through much of the PV she is standing on a stage area in front of crowd of gray, shiny humanoid figures next to a DJ booth staffed by a figure with emon's logo as his head. The booth itself has the word "emon" written in yellow letters across the front.
Miku sings the majority of the song, with the Kagamines echoing. Toward the middle of the song, however, there is a spot where they both have short solos. Len is yellow, Rin is orange, and together they are brown.