UNDER17 or "Ansebu", was a duo consisting of singer Haruko Momoi (桃井はるこ, nicknamed "Halko") and guitarist Masaya Koike (小池雅也, nicknamed "Aniki" meaning "Big Brother"). The duo was officially founded in 2002, although the pair had worked many times before since the late 1990s. The band is known for its distinct cute vocals as heard in many anime and games, and has been an influential force in "moe song," a category of music that focuses on cute female vocals and pop beats.

Read more about UNDER17 on Last.fm.