Sotaisei Riron

 (相対性理論) is a Japanese indie pop-rock synth band that first formed in 2006.

Not much is known about the band, other than they mainly do live shows.

Current

 * Yakushimaru Etsuko (やくしまるえつこ; Vocals)
 * Nagai Seiichi (永井聖一; Keyboard)
 * Yoshida Tadasu (吉田匡; Bass)
 * Yamaguchi Genki (山口元輝; Drums & Percussion)

Former

 * itoken (Keyboard & Percussion)
 * Mabe Shuichi (真部脩一; Bass, Drums & Chorus)*
 * Nishiura Kensuke (西浦謙助; Drums)*
 * Nishiura is also active in the bands Luminous Orange and Mass of the Fermenting Dregs as a support drummer.
 * Left in January 2017 to form band Group Action.a

Singles

 * [2010.01.16] Our Music (アワーミュージック)
 * [2010.09.29] Ranbo to Taiki (乱暴と待機)

Collaboration Single

 * [2010.07.21] Dum-Dum/The Vaselines (With QKMAC)

Live Singles/Limited

 * [2013.10.25] YOU & IDOL
 * [2015.03.22] Spectrum (スペクトル)

Studio Albums

 * [2007.06.15] Chiffon Shugi (シフォン主義)
 * [2009.01.07] Hi-Fi Shinsho (ハイファイ新書)
 * [2010.04.07] Synchronicity (シンクロニシティーン)
 * [2013.07.24] TOWN AGE
 * [2016.04.27] Tensei Jingle (天声ジングル)

Remix Album

 * [2011.04.07] Tadashii Sotaisei Riron (正しい相対性理論)