I'm not sure any of these videos are legitimately supposed to be on Youtube but while they are there here are a few videos from groups that make 8bit based music.
House Watch by Consumers
Tetrominon by YMCK
Panic Racer by YMCK
Milky Blue by YMCK
La La is Love − Music by Bear-Garden a Thai group, video by YMCK
Okesuchi by Kplecraft
Hamlin intro by Kplecraft