Just recently discovered this guy.
Skip to a minute and a half in if you want to skip the typical intro deal.
St. Vincent - Semi-live-studio performance. 3 minutes in is a good place to start if you're unfamiliar with her work. Sublime is a good word for it.
And a few classics. CSNY:
This one is too good, imo. CSNY with Tom Jones. What? It's fucking great.