RYTHEM (リズム) was a Japanese pop duet who were under the Sony Music Entertainment label. The talented duo was formed by Niitsui Yui a.k.a Yui (新津由衣), on piano & vocal position and Katou Yukari a.k.a Yuka (加藤有加利), on acoustic guitar & vocal position. Their debut single was Harmonia (ハルモニア), released on May 2003, which song was used as the 2nd ending theme of Naruto, a popular anime in Japan. On October 2010, the duo announced on the streaming site ustream that they would disband in 2011. Read more on Last.fm