In no particular order:
I Won't Give Up-Jason Mraz
I'm Getting Ready-Michael Kiwanuka
Little Black Submarine-The Black Keys
Heavyweight-Our Lady Peace
I'm not making a lot of comments about the songs here, but 'Heavyweight' was an extremely exciting release. It made it seem like it was 1996 again in the absolute best possible way. I felt like a kid in a record store. I've liked OLP's music of the last decade, but I love this return to their roots.
Little Talks-Of Monsters and Men
Too Close-Alex Clare
My Oh My-Tristan Prettyman
Stars-Grace Potter and the Nocturnals
Live and Die-The Avett Brothers
Love Interruption-Jack White
The A-team-Ed Sheeran
Somebody That I Used to Know-Gotye feat. Kimbra
Gloom and Doom-The Rolling Stones
Just the fact that these guys are still at it–and still have it–after 50 years, is amazing. Oh, to be the Rolling Stones.
As an aside, I discovered 'Cut Me Some Slack' by Paul McCartney, Dave Grohl, Novoselic and Smear the day before 2013. I didn't really get to enjoy it in 2012, having heard only half. I can safely assume that a Sir Paul/Grohl collaboration is amazing and one of those things which is so good, it's unfair to other musicians. I look forward to listening to it again.