Supercell is an 11-member Japanese pop rock band led by musician and songwriter Ryo, which formed in 2007 as a dōjin music band. The other 10 members are artists and designers who provide illustrations in album booklets and music videos. Supercell started out by making use of the Hatsune Miku Vocaloid singing synthesizer to produce vocals for songs submitted to the Nico Nico Douga video sharing website. The popularity of the songs led the band to release their independent self-titled album Supercell (2008). Supercell later signed to Sony Music Entertainment Japan and had a professional release of their Supercell album in March 2009, which was updated with more songs.

Vocaloid is a singing voice synthesizer software product. Its signal processing part was developed through a joint research project between Yamaha Corporation and the Music Technology Group in Universitat Pompeu Fabra, Barcelona. The software was ultimately developed into the commercial product "Vocaloid" that was released in 2004.