Ken Hirai is a Japanese R&B and pop singer. Since his debut, Hirai has worked as a model, actor, composer, lyricist, singer, and spokesperson. During his career, Hirai has released 32 singles and 11 albums up until October 2010. According to Oricon, his single Hitomi Wo Tojite became the best-selling single of 2004 in Japan. While his compilation album Ken Hirai 10th Anniversary Complete Single Collection '95–'05 "Utabaka" became the best-selling album of 2006 in Japan.