Shi No Kakaku

Sōtaisei Riron 相対性理論

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