そろばん (Soroban) was a japanesevisual indiesrock band. Their songs are upbeat rock songs; sometimes quite heavy with screaming vocals, distorted guitars and pounding drums. The members of そろばん had already started making music by the time they were in their early teens. In April 2002 the four of them decided to start a band together, named Primrose. Despite their young ages -when they started they were between 14-16-, they managed to gain quite a bit of success. Their line-up this time was 龍寺 (Ryuuji) on vocals, 夢人 (Yumehito) on guitar, たつひ (Tatsuhi) on bass and ゆうや (Yuuya) on drums.