Music Taking Care of Business

It's the work that we avoid
And we're all self-employed
We love to work at nothing all day
And we be...
Taking care of business every day
Taking care of business every way
I've been taking care of business, it's all mine
Taking care of business and working overtime

Excerpted from TCB by BTO ... or, Taking Care of Business by Bachman Turner Overdrive.
Anyway, is there a song you listen to when you have to take care of business? A song that gets you really pumped for whatever you have to do, or maybe one that relaxes you so you can focus?