There are at least 2 artists by this name:

1) Rita is a Japanese voice actress, singer, and lyricist from Osaka, also using the 理多 name when voice acting. She is mainly active in the video game music scene. In 2004, she formed Blueberry&Yogurt with Toshihiko Uchiyama (内山利彦, musical composer) and Takamatsu”AND” (高松アンド, vocal engineer), who left the group in late 2005. She has released over 10 albums and singles, and she often titles her albums with words beginning with the letter M.