Sound of Music Pt. 1

On April 7, 2025, a teaser video shared via Jannabi's official social media channels shows the duo dressed in crisp white shirts. The two are seen shaking hands formally and signing a document. A desk calendar marked with a yellow-circled date and a bold lightning bolt logo hints at the significance of the album launch on April 28. The album is the band's first new release in almost a year and ten months since their June 2023 single, "Pony", and it celebrates the eleventh debut anniversary of Jannabi.^[2] Ahead of the release, Jannabi also shared a self-interview series covering the production process and new profile photos, giving fans a glimpse into the album's direction.^[3] The members reflected on what music means to them today — not just as artists, but as people rediscovering joy through their craft. While the new record leans into nostalgia as its core theme, Jannabi aimed for sound collage.^[4] On April 21, it was revealed on the band's social media channels that Karina of Aespa would be featured on the title track of their album.^[5]

Jannabi held a solo concert titled All the Boys and Girls 2025 at Jamsil Arena in Seoul on April 26–27 and May 3–4. "All the Boys and Girls" is part of the tracks for their fourth album. For the first week in Seoul, there was a pre-release live for their album, and for the second week, there was a special live after the release. The band then travelled and performed at Gwangju Women's University's Universiade Gymnasium in Gwangju on June 14 and 15 and EXCO East Wing Hall 6 in Daegu on June 28 and 29.^[6]

All lyrics are written by Choi Jung-hoon. All tracks are composed and arranged by Choi and Kim Do-hyung, except where noted. All tracks are produced by Choi.