Soutaiseiriron (相対性理論)

Soutaiseiriron (相対性理論, Theory of Relativity) is a Tokyo-based Japanese rock band formed in 2006 and signed to Mirai Records. The band is known for not revealing information or taking photos; they do not appears in press or their promotional videos and have very small interaction with the audience during live events. Soutaiseiriron debuted in June 2007 with the mini-album Chiffon Shugi. The album was remastered and re-released in May 2008, and topped Tower Record's indie chart. Following the success of Chiffon Shugi, they released their first studio album, Hi-Fi Shinsho, on January 7, 2009.

Members:
Etsuko Yakushimaru (やくしまるえつこ) - Vocals, Illustration and Narration
Shuichi Manabe (真部脩一) - Bass
Seiichi Nagai (永井聖一) - Guitar
Kensuke Nishiura (西浦謙助) - Drums

シフォン主 (Chiffon Shugi)

01.スマトラ警備隊
02.LOVEずっきゅん
03.夏の黄金比
04.おはようオーパーツ
05.元素紀行

ハイファイ新書 (Hi-Fi Shinsho)

1. テレ東
2. 地獄先生
3. ふしぎデカルト
4. 四角革命
5. 品川ナンバー
6. 学級崩壊
7. さわやか会社員
8. ルネサンス
9. バーモント・キス

シンクロニシティーン (Synchroniciteen)

1. シンデレラ
2. ミス・パラレルワールド
3. 人工衛星
4. チャイナアドバイス
5. (恋は)百年戦争
6. ペペロンチーノ・キャンディ
7. マイハートハードピンチ
8. 三千万年
9. 気になるあの娘
10. 小学館
11. ムーンライト銀河