구현모 (KOO) – 언젠가
Track 01 from Single "언젠가"
Release Date: 2020.10.23
구현모 (KOO) – 표현해줘
Track 01 from Single "표현해줘"
Release Date: 2019.04.11
구현모 (KOO), Riby-J – 휴가 (Lets Go)
Track 01 from Single "휴가 (Let's Go)"
Release Date: 2015.07.24
구현모 (KOO) – Fly Away (Feat. 유미나)
Track 01 from Single "Fly Away"
Release Date: 2015.10.06