There are some really great music posted previously in this thread, and I thought I'd add a few more that I like.
Let's start with some bands from my country, NorwayA couple of tracks from the great Norwegian folk band Katzenjammer, adds +2 to you mood, guaranteed:
Katzenjammer - Ain't No Thang (Live...in a small boat)Katzenjammer - A Bar In Amsterdam...
and a couple of tracks from the fantastic (now disbanded) Gåte. Norwegian folk music meets progressive rock. This band is (was) quite possibly the best live band to ever set foot on this lovely little planet.
Gåte - Bendik og ÅroliljaGåte - Sjå AttendeEl Caco is another band from .no. I don't listen to them all that much, but this video is just to much fun not to post!
El Caco - Substitute...and now for some assorted good tracks from other placesFeeling a bit down, and need a tune to cheer you up? This one from the Canadian band Immaculate Machine works wonders for me:
Immaculate Machine - C'mon Sea LegsGrace Potter and the Nocturnals are one of my favorite bands, and if you listen to a few of their tracks I'm sure you'll understand why.
Grace Potter and the Nocturnals - Apologies (Live)Grace Potter and the Nocturnals - Stop the Bus (Live)....