Aa! was a Japanese pop unit under the Hello! Project umbrella, active from 2003 and again during a 2009 revival period. Led by Morning Musume's Tanaka Reina alongside Hello! Project Kids members Natsuyaki Miyabi and Suzuki Airi, the group delivered upbeat J-pop with dance-oriented production that characterized the Hello! Project's signature sound during the early 2000s.
Though the group's initial run was brief, with limited single releases, Aa! represented an important moment in Hello! Project's experimental approach to unit formations, blending members across different sub-groups to create fresh vocal combinations and arrangements that appealed to fans of Japanese pop and dance music.
