고준석, 최선 – 악귀
Track 01 from EP '네이버 웹툰 '작두' OST : 악귀'
최선 – 진주 귀걸이를 한 소녀
Track 01 from Single "진주 귀걸이를 한 소녀"
Release Date: 2020.11.19
최선 – 너 말고 너
Track 01 from Single "너 말고 너"
Release Date: 2021.06.02
최선 – 인생시계
Track 02 from EP "위하여/인생시계"
Release Date: 2019.05.16
최선 – 위하여
Track 01 from EP "위하여/인생시계"
Release Date: 2019.05.16
건호, 연호, 최선 – Christmas Memory
Track 08 from Album "Christmas With ROUTE LABEL"
Release Date: 2018.12.17
최선 – 이 노래를 듣고 있을 너에게
Track 07 from Album "Christmas With ROUTE LABEL"
Release Date: 2018.12.17
최선, 졸린 – 크리스마스잖아요
Track 03 from Album "Christmas With ROUTE LABEL"
Release Date: 2018.12.17
지금 (JIGM), 최선, 졸린, 건호, 연호, LIZRO, 미온 – Happy Christmas
Track 02 from Album "Christmas With ROUTE LABEL"
Release Date: 2018.12.17