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Sotaisei Riron



Album list
Singer Intro


Sōtaisei Riron (相対性理論?, lit. 'Theory of Relativity') is a Japanese rock band formed in Tokyo in September 2006.

The band is known for not revealing much about their private lives. Media coverage concerning the band is minimal and taking photos during live occasions is strictly forbidden. The band derives its influences from genres such as kayōkyoku, group sounds and post-rock. Song titles as well as lyrics often involve plays on words and pop culture references. According to guitarist Seiichi Nagai, the band composes most of their music together.

The debut mini-album, Chiffon Shugi was the winner of the 1st All Japan CD Shop Award, and their second album, Hi-Fi Shinsho ranked No. 7 in the Oricon weekly chart.

The third album, Synchroniciteen was released on April 2010. The album consists of both all-new songs and songs already performed live during numerous live events.

The fourth album, Tadashii Sōtaisei Riron, had a planned release date of March 23, 2011. However, it was postponed due to the 2011 Tōhoku earthquake and tsunami and was finally released on April 27, 2011. Tadashii Sōtaisei Riron is a remix album with three new songs and a total of ten remixes of already released Sōtaisei Riron songs.

Band members

Etsuko Yakushimaru (やくしまる えつこ Yakushimaru Etsuko?) – lead vocals

Yakushimaru is also known for her illustration and narration work. She uses the alias Tica·α (ティカ・α Tika arufa?) in songwriting and composition work.

Seiichi Nagai (永井 聖一 Nagai Seiichi?) – guitar

Nagai has also worked as a producer, having produced acts such as Spangle call Lilli line.

Shūichi Mabe (真部 脩一 Mabe Shūichi?) – bass
Kensuke Nishiura (西浦 謙助 Nishiura Kensuke?) – drums

Nishiura is also active in the bands Luminous Orange and Mass of the Fermenting Dregs as a support drummer.