That's another issue I run into. "What the fuck do you mean Spotify doesn't have Gregg Kowalsky's newest work??"
And I feel I'm wasting my time and money streaming music through an AMP/DAC and high end headphones.
EDIT: HA! In my haste to prove a point, I didn't actually check Gregg specifically, but decided to for the fuck of it afterward. Spotify does, in fact, have a fair amount of his work. Hilarious.