At this point anyone who has read Barbara Ehrenreich's Nickel and Dimed can tell you what is at stake with the Wal-Mart worker's strike. Ehrenreich tried to live off of a Wal-Mart worker's wage, and discovered rather quickly that she couldn't live anywhere in the vicinity of the Wal-Mart at which she was hired, because the rents in that neighborhood were just too high for the paltry wage she was earning.
So there's going to be a strike next Friday at your local Wal-Mart, and at Wal-Marts across the nation. Be sure not to cross the picket line, and be sure to sing these songs when you're there in support of the strikers:
For "rousing" there's nothing like Billy Bragg:
Here's a good confrontational song for regaling the WalMart clientele:
This video combines two great union songs, both of Utah Phillips and Ani DeFranco:
I'm sure you'll recognize the tune to this one.
I'm quite fond of The Weavers -- here's their cover of Sixteen Tons:
Here's Steve Earle with a bit of labor history and a meaningful tune:
Yeah, OK, this isn't entirely in-genre...
And it seems that this song is just as pertinent today as it was then:
Meanwhile, In These Times has a fun article on unions which you should read.