"Fireflies (JP Version) - Rock Band 3" is a high quality rip of the JP version of "Fireflies" from Rock Band 3.
Jokes[]
The advertised track is mashed up with "Pajamy (パジャミィ)" by Iyowa ft. Hatsune Miku. At 1:00 and 2:29, the track is briefly sentence-mixed to sing "Pajamy (パジャミィ)".