Quick answer — Cher Watanabe worked on Tennis no Ouji-sama: Zenkoku Taikai-hen Final (Music), Tennis no Ouji-sama: Zenkoku Taikai-hen (Music), Tennis no Ouji-sama: Zenkoku Taikai-hen Semifinal (Music) and 9 more anime.
Cher Watanabe worked on Tennis no Ouji-sama: Zenkoku Taikai-hen Final (Music), Tennis no Ouji-sama: Zenkoku Taikai-hen (Music), Tennis no Ouji-sama: Zenkoku Taikai-hen Semifinal (Music), The Prince of Tennis (Music), Onegai My Melody (Music), The Prince of Tennis II (Music), Tower of Druaga: The Sword of Uruk (Theme Song Composition), So, I Can't Play H! (Music) and 4 more.