MOSAIC.WAV is a Japanese moe-pop band from Akihabara, widely known for doing theme songs to eroge, they eventually began to produce their own original work in 2004. Their name is a reference to the use of mosaics to censor the genitals in pornography, and WAV is a sound format.

MOSAIC.WAV is fronted by vocalist MI-KO, with keyboardist Susumu Kayamori and guitarist Masaya Koike backing her up.

They dubbed their own music as Akiba-Pop, J-pop covered by numerous Akihabara cultural references, this including fantasy anime and video game themes.

[From AniDB]