홍가 – 숲 (Feat. 양은선)
Track 01 from Single "Forest S"
Release Date: 2018.05.29
홍가 – 다 됐고
Track 01 from Single "영화 일진 OST"
Release Date: 2018.02.23
홍가 – 뭐 어쩌라고
Track 01 from Single "SoWhat Single"
Release Date: 2018.01.19
홍가 – 역지사지 (Feat. 리틀에스) (Narration Ver.)
Track 02 from Single "역지사지"
Release Date: 2016.05.13
홍가 – 아마도 내일은
Track 01 from Single "아마도 내일은 OST"
Release Date: 2017.03.16
홍가 – 그런날이 있지
Track 01 from Single "Such a day S"
Release Date: 2018.12.11
홍가 – Rooftop (Feat. 송민곤)
Track 01 from Single "Rooftop S"
Release Date: 2018.09.12
홍가 – 새벽 2시 (Feat. 김수현)
Track 01 from Single "Midnight S"
Release Date: 2018.11.06
홍가 – 역지사지 (Feat. 리틀에스)
Track 01 from Single "역지사지"
Release Date: 2016.05.13
홍가 – nostress
Track 01 from Single "nostress S"
Release Date: 2018.07.27
홍가 – 걸리지마라 (Feat. 길건)
Track 01 from Single "Girl리지마라"
Release Date: 2015.09.04
양은선, 홍가 – 사랑에 다쳤나봐요
Track 01 from Single "홍라보 (HongLaBo) Part.3"
Release Date: 2018.02.12
빛나, 홍가 – FooL
Track 01 from Single "홍라보 (HongLaBo) Part.2"
Release Date: 2017.11.02
홍가, Fenner – Designer (Fenner Remix)
Track 02 from Single "designer S"
Release Date: 2020.08.28
홍가 – Designer
Track 01 from Single "designer S"
Release Date: 2020.08.28
하진우, 홍가 – 첫학기 (부제 : Family Love)
Track 01 from Single "첫학기 (1st Sem) OST"
Release Date: 2018.01.26
Risso (리소), 홍가 – 알까?
Track 01 from Single "홍라보 (HongLaBo) Part.1"
Release Date: 2017.07.24