Itō and Ueno also sing "Daichi no La-li-la" (大地のla-li-la, literally "La-li-la of the Earth") together, the ending theme to the anime Scrapped Princess, although not under the band name Oranges & Lemons.
Masumi Itō (伊藤 真澄 Itō Masumi) was born on May 21 and is from Ibaraki prefecture in Japan. She sings, composes music and plays the piano. Itō also uses the pseudonym Hikaru Nanase (七瀬 光 Nanase Hikaru). She is also part of the group Heart of Air. She is married to the music producer Yoshiyuki Itō. Itō's birth name is Masumi Nitta (新田 真澄 Nitta Masumi) and her blood type is A.
Yōko Ueno (上野 洋子 Ueno Yōko), born October 11, 1963, is a singer and theme song composer. Aside from Azumanga Daioh, Ueno has written music for .hack//Legend of the Twilight and Brigadoon: Marin & Melan. She sometimes calls herself just Yōko, for example she is credited as such for her performance of the Sōkō no Strain opening song. She has also performed in the bands Vita Nova, Marsh-Mallow and Zabadak.