GQ got a bit stale for me.
followed him and all his sub channels for ages and got bored after a year of it.
moved on to https://www.youtube.com/user/majesticcasual through GQ chillstep mixxes
I usualy listen to sad music whenever i'm looking for inspiration, however when i'm actually drawin' i listen to like happy stuff: Trance,Happy-hardcore etc.
Also have really gotten into full albums and VG ost playlists. Since you don't have to keep changing the song when listening to those. NieR and Catherine are two good VG osts that come to mind for drawing.