Relativity’s Hit Song Rankings [2026]

Miss Parallel Worldsōtaisei riron8rank/position

Theory of Relativity: Miss Parallel World

It’s a superb pop tune that feels like you’re gently floating through weightless outer space.

Yakushimaru Etsuko’s dreamy vocals are soothing.

When you need to focus seriously, it’s said to help to deepen your breathing and release unnecessary tension from your body first.

It’s also recommended to listen once to relax before diving into concentrated work, like studying for exams or certifications.

Ultra Sodasōtaisei riron9rank/position

Theory of Relativity – Ultra Soda – Single

It’s a song with mysterious lyrics whose meaning you’re never quite sure of, whisper-like vocals, and a gentle, pleasant melody—definitely something that’ll get stuck in your head.

The lyrics have wordplay-like parts that put you in a fun mood.

In particular, many listeners will find themselves captivated by Etsuko Yakushimaru’s languidly cute voice.

Moonlight Galaxysōtaisei riron10rank/position

Theory of Relativity – Moonlight Galaxy

A band known for many philosophical songs, Soutaiseiriron.

From their album “Synchroniciteen,” I’d like to introduce “Moonlight Galaxy.” This one has a super slow tempo and a gentle, soothing feel.

It runs a bit long at around six minutes, which lets you really savor the performance and vocals.

By the way, the points that evoke space are where words like “galaxy” appear in the lyrics.

It’s rich in metaphor, so it’s fun to ponder what kind of scenes it’s depicting.

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Kids Returnsōtaisei riron11rank/position

Kids No Return (single ver.)

In the 2000s, Sotaisei Riron suddenly burst onto the Japanese rock scene, quickly becoming a sensation thanks to vocalist Etsuko Yakushimaru’s uniquely sweet, conversational singing voice and the band’s experimental musicality.

Among their tracks, one that I’d like to highlight for its use of an irregular meter is Kids No Return, included on a single sold exclusively at live shows.

The 11/8 time signature is certainly noteworthy, but what truly stands out is Yakushimaru’s commanding vocal presence, which remains unfazed by such rhythmic idiosyncrasy.

summer solsticesōtaisei riron12rank/position

Soutaiseiriron “Gacy” June 21, 2025

Soutaiseiriron is a project that creates unparalleled music with a unique sci-fi worldview and experimental sound.

One track on their classic 2016 album Ten Sei Jingle takes a special summer day as its theme.

Etsuko Yakushimaru’s whisper-like vocals meld with floating electronica textures to produce a subtly surreal yet soothing atmosphere.

The lyrics depict the restlessness and bittersweet memories from one’s teenage years into adulthood.

The daily clamor of wanting to escape ordinary life—and the gentle message that affirms those feelings—quietly moves the listener.

This work is also known for releasing its accompanying video every year on the summer solstice, making it a perfect number for those who want to drift into reverie on a summer night.