Tsubasa Reservoir Chronicles

Tsubasa: Reservoir Chronicle (Japanese: ツバサ-RESERVoir CHRoNiCLE- Hepburn: Tsubasa: Rezaboa Kuronikuru) is a shōnen anime based on the manga written and illustrated by the manga artist group Clamp. It takes place in the same fictional universe as many of Clamp's other manga series, most notably xxxHolic. The plot follows how Sakura, the princess of the Kingdom of Clow, loses all her memories and how Syaoran, a young archaeologist who is her childhood friend, goes on a quest to save her. Dimensional Witch Yūko Ichihara instructs him to go with two people, Kurogane and Fai D. Flowright. They search for Sakura's memories, which were scattered in various worlds in the form as feathers, as gathering them will help save her soul.

The Afternoon Piano (Season 1, Episode 20)
Fai buys a piano for The Cat's Eye but he doesn't know how to play it. Kurogane begins training Syaoran on how to counteract him being blind in his right eye by learning how to balance between his left and right side. A strange woman comes into the The Cat's Eye and starts asking Sakura where she's from and why she's here. Sakura goes into a trance and the woman starts playing the piano and Sakura starts singing "You are my love" in Japanese "Lost Memories" in English Dub.