I've got a few tracks I keep returning to. Weirdly enough there's this old extended dance version of Peter Gabriel's "Sledgehammer" that tends to help me focus on my artwork when all else fails. Obviously I'm a big fan of the FFXIV and Ace Combat series' OSTs, too.

But I sometimes just go to whatever jazz streaming channels I can find on Youtube and go with those. Less fond of lo-fi, though.