Tolong jelaskan mengenai "Overture" dari Team A 1st Stage "Party ga Hajimaru yo"

"Aozora no Soba ni Ite"

Team A 1st Stage "Party ga Hajimaru yo" (DVD)

Tomomi Itano, Yuki Usami, Kazumi Urano, Tomomi Oe, Mai Oshima, Ayumi Orii, Nozomi Kawasaki, Haruna Kojima, Hitomi Komatani, Yukari Sato, Minami Takahashi, Hana Tojima, Rina Nakanishi, Risa Narita, Natsumi Hirajima, Michiru Hoshino, Atsuko Maeda, Kayano Masuyama, Minami Minegishi, Shiho Watanabe