Karaoke Popular Songs Ranking of back number [2025]

yellowback number29rank/position

back number – Yellow

A song released in 2021 by back number, unrivaled when it comes to writing unrequited love songs.

It was chosen as the theme song for the ABEMA original show “Koi to Ookami ni wa Damasarenai” (Don’t Be Fooled by the Wolf).

This poignant love song portrays the feelings of a protagonist who struggles with an unreachable crush while trying to suppress their emotions.

The lyrics are written without specifying gender, allowing people in various situations to relate.

Be sure to consider the meaning behind the title “Yellow”!

Emeraldback number30rank/position

back number – Emerald

Emerald, the second digital single selected as the theme song for the TV drama “Dangerous Venus.” The intro featuring tight guitar cutting gives the entire ensemble a refreshing sense of drive and tension.

While the vocal range itself is narrow, the melody moves back and forth between chest voice and falsetto throughout, so it’s important to stay mindful not to miss the pitch.

If the original key doesn’t suit your voice, adjust to a comfortable setting, taking into account the falsetto sections and the key change near the end.

phantom thiefback number31rank/position

back number – Phantom Thief

This is a digital-only single by back number, released on May 24, 2021.

It was selected as the theme song for NTV’s Wednesday drama “Koi wa Deep ni.” While many recent songs feature complex rhythms and melodies, this track has a very easy-to-groove tempo, and the vocal melody is smooth and, I believe, quite easy to sing.

However, in the high notes of the chorus, the vocalist skillfully switches between chest voice and falsetto, so if you’re not confident in smoothly transitioning your vocal registers, you may want to pay a bit of attention to key settings and such.

Conversely, it’s also ideal as a practice piece for register transitions, so with that in mind, I encourage you to give it a try!

one roomback number32rank/position

One Room

The back number classic “one room,” with its strikingly orthodox J-pop rock melody, leaves a strong impression.

Since it was released early in their career, the youthful quality of vocalist Iyori Shimizu’s voice also stands out.

The most singable aspect of this song is, above all, its chord progression.

Because it uses chords frequently heard in Japanese pop, every part makes it easy to find the pitch.

In addition, the vocal range is narrow, so even those who can’t hit high notes should be able to sing it without issue.

After you closed the doorback number33rank/position

Kimiga Door O Shimeta Ato

The back number classic “Kimi ga Doa wo Shimeta Ato,” where emotive lyrics truly shine.

Sung from a male perspective about the feelings right after a breakup, it’s characterized by its deeply heartrending lyrics.

Interestingly, despite its emotional words, the song features a surprisingly plain and understated vocal line.

Because of that, it’s easy to sing for those who struggle with ballad-like delivery that demands dramatic dynamics.

The vocal range is narrow and there are few long sustained notes, so even singers with lower or huskier voices should definitely give it a try.

The curtain risesback number34rank/position

back number – The Curtain Rises [Theme song for the film 'TOKYO MER: Mobile Emergency Room – Nankai Mission']

It’s the theme song for the theatrical release “TOKYO MER: Mobile Emergency Room – Nankai Mission,” hitting theaters on August 1, 2025, and it feels very much like a classic back number track.

Compared to other songs, the average vocal range is lower and the difficulty is relatively mild, making it easier to take on; however, there are lots of switches between chest voice and falsetto in the chorus and the bridge.

I think that’s the key to really delivering this song! Basically, aim to resonate in the head and sing the whole piece gently.

That way, your chest voice won’t sound forced but will come out airy and open, making transitions to falsetto smoother.

Also, falsetto uses more breath than you might think, so take in plenty of air through your mouth wherever you can breathe.

The highest note, C5, appears in the bridge; if you imagine ringing the very top of your head and push a little more firmly there, it should land beautifully!

Letterback number35rank/position

back number – Letter (full)

A wedding is a precious day that marks the start of a couple’s new life together.

This back number classic is perfect for such a special occasion.

It’s a medium-tempo ballad that honestly expresses gratitude to one’s parents, filled with memories shared between parent and child from childhood to the present.

Released in August 2015 and featured in an NTT Docomo commercial, the song’s music video stars Kanna Moriya and movingly portrays the bond between a mother and her son.

It’s recommended for anyone who wants to express heartfelt thanks to someone important.

If you give it together with a letter of gratitude to your parents, it will surely touch their hearts!