i like reggae.
Muddy waters or the toots and the maytals are my personal favourite to get me in the mood but its definately a personal thing.
In all seriousness, it is a personal thing, but im a huge fan of stuff like
Rise against, millencolin, anti-flag, A, The prodigy
I know others would prefer to listen to metal and others would prefer Hip hop or whatever the kids call it these days. Its just whatever music you feel will get you pumped up.