Be First Mainstream Official Audio - Monrovia Science Research Center

3:51

BE:FIRST / Mainstream -Official Audio-

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4:12

BE:FIRST / Mainstream -Music Video-

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4:03

BE:FIRST/ Mainstream -from BE:FIRST LIVE in DOME 2024 “Mainstream – Masterplan”-

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3:27

BE:FIRST 'Mainstream' Official Audio

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3:48

BE:FIRST / Mainstream -Dance Practice-

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3:48

BE:FIRST / Mainstream -Dance Performance-

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3:24

【歌詞・パート割り】BE:FIRST：Mainstream

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3:45

BE:FIRST / Masterplan -Official Audio-

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3:27

BE:FIRST 'Mainstream' Official Audio

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6:48

250423 BE:FIRST 'Mainstream + Spacecraft' | World Tour 2025 -Who is BE:FIRST- in San Francisco

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3:29

BE:FIRST - Mainstream [Color Coded Lyrics/Kan/Rom/Eng]

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3:22

BE:FIRST / Mainstream （ Tyla WE WANNA PARTY ASIA TOUR）Nov.11th 2025 Tokyo

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5:20

Outkast - Mainstream (Official Audio)

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3:24

BE:FIRST / Mainstream -Special Performance-

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4:36

BE:FIRST - Mainstream Official Audio REACTION

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Be First Mainstream Official Audio Information Guide

Introduction on Be First Mainstream Official Audio
Main Features
Developments
Expert Insights
Final Thoughts

Introduction on Be First Mainstream Official Audio

Details BE:FIRST / Mainstream -Official Audio- News

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Main Features

Information BE:FIRST / Mainstream -Music Video- Update

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Developments

BE:FIRST/ Mainstream -from BE:FIRST LIVE in DOME 2024 “Mainstream – Masterplan”- Guide

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BE:FIRST / Mainstream -Dance Practice-

BE:FIRST / Mainstream -Dance Performance-

【歌詞・パート割り】BE:FIRST：Mainstream

BE:FIRST / Masterplan -Official Audio-

BE:FIRST 'Mainstream' Official Audio

250423 BE:FIRST 'Mainstream + Spacecraft' | World Tour 2025 -Who is BE:FIRST- in San Francisco

BE:FIRST - Mainstream [Color Coded Lyrics/Kan/Rom/Eng]

BE:FIRST / Mainstream （ Tyla WE WANNA PARTY ASIA TOUR）Nov.11th 2025 Tokyo

Outkast - Mainstream (Official Audio)

BE:FIRST / Mainstream -Special Performance-

BE:FIRST - Mainstream Official Audio REACTION

Expert Insights

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Last Updated: August 19, 2026

Final Thoughts

Full BE:FIRST 'Mainstream' Official Audio Update

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Be First Mainstream Official Audio Information Guide

Introduction on Be First Mainstream Official Audio

Main Features

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Final Thoughts

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