The second one...

Because the world needs more rock and roll right now.

Track Listing:
Want It Back, by Amanda Palmer
The Only One, by The Black Keys
Palaces of Montezuma, by Grinderman
I'll Dream Alone, by The Magnetic Fields
I Might, by Wilco
Black Math, by The White Stripes
The Nothing Part Two, by Lady Lamb the Beekeeper
Short Version, by Wild Flag