not playing an artist??

[hongkongaton]

listen i really really love gorillaz. and i love listening to their music.
it works fine if i do my playlist that's just gorillaz songs but if i shuffle my normal playlist there's no gorillaz.
i have spotify premium and if i select a certain gorillaz song it works for that song but it won't play any more after that.
it's really annoying i just want to listen to gorillaz