조광일 – 회상록 (Orchestra Ver.)
Track 01 from Single "회상록 (Orchestra Ver.)"
Release Date: 2020.12.22
임상현 – 비가 오던 밤
Track 01 from Single "비가 오던 밤"
Release Date: 2021.07.25
조광일, 브라운티거 (Brown Tigger), walo, Yonge Jaundice (영 잔디스) – 4 Harsh Carls
Track 01 from Single "4HC (4 Harsh Carls)"
Release Date: 2021.01.29