關口和之

Kazuyuki Sekiguchi (関口 和之, Sekiguchi Kazuyuki, born December 21, 1955 in Niigata Prefecture) is a Japanese musician, best known for playing the bass guitar for Southern All Stars. As a solo artist, he has played ukulele. He is a fan of Hawaiian music, and is the founder of the annual Ukulele Picnic music festival in Hawaii. For over thirty years, Sekiguchi has worked with Akira Sakuma in the Momotaro Dentetsu video game series as a music composer.