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