The first soundtrack of JTBC's "Sing Again - Unknown Singer Season 4" will be released. This program is a reboot audition show that helps unknown singers stand before the public again. The first soundtrack, "Episode 1," will be released at noon on the 15th through various music sites.

This soundtrack includes a total of five songs: No. 19's "Iguana," No. 23's "Please Wait," No. 37's "Hongdae R&B," No. 61's "Butterfly Effect," and No. 65's "From Mark."

No. 19's "Iguana" is a newly reinterpreted song from Kang San's 8th album. It features an acoustic arrangement composed of guitar, vocals, and kazoo.

No. 23's "Please Wait" is a song from the late Kim Kwang-seok's first album, containing sincere lyrics that express the desire to reach out to listeners.

No. 37 reinterpreted and performed singer BIBI's original song "Hongdae R&B." Adding dynamic and soul to the original song's lively charm, they recreated it in their own style.

No. 61's "Butterfly Effect" is a track from Shin Seung-hoon's project album, honestly conveying the emotions of love and farewell. It delivers a message of living on despite the regrets and lingering feelings of parting.

The final track, No. 65's "From Mark," is a remake of Ha Dong-kyun's song from his 2nd album. It conveys a message of hope to rise again at the end of despair, expressing the moments of frustration encountered while running toward dreams with an honest voice.

The soundtracks capturing the earnest performances of "Sing Again 4" participants will be released sequentially every Wednesday at 12 PM through various music sites.