I vouch for Drunken Lullabies. I hate the title of the song, but it's really sweet
Rainbowdragoneyes - "Creatures ov Deception" Video preview
Guitar - 5
Vocals - 2
Drums - 5
Bass - 4
Band - 6
It's awesome. All there needs to be said about it.
Rock Band 3 version is coming out soon, but it's still technically a dollar and still technically worth the purchase at the time of writing
(The video preview doesn't have the whole song, just the Authoring preview of it. I couldn't find a full band play of the full song. If that's a problem, then sorry)
I would add it but if a RB3 version is on the way then i don't want to recommend getting one with less features.