Best! Morning Musume 20th Anniversary (Japanese: ベスト!モーニング娘。20th Anniversary, Hepburn: Besuto! Mōningu Musume 20th anniversary)[1][2] is a compilation album by Japanese idolgirl groupMorning Musume. It was the group's 8th compilation album and was released in Japan on March 20, 2019 with three versions: one regular edition and two limited editions. It includes members from their 2019 lineup as well as their "OG" alumni dating back 2007.