Yoohei Kawakami (Japanese: 川上 洋平, born June 22, 1982) is a Japanese musician, singer-songwriter, composer and actor, best known as the lead vocalist and rhythm guitarist of the rock band [Alexandros]. Yoohei Kawakami (Japanese: 川上 洋平, born June 22, 1982) is a Japanese musician, singer-songwriter, composer and actor, best known as the lead vocalist and rhythm guitarist of the rock band [Alexandros].