Frank, I think it depends on the mood. That version of Dean Martin's "Sway" might be perfect for relaxing with a martini. But walking through the halls of Congress on the way to a caucus meeting to rally the troops... well, that calls for stronger stuff.
Ryan famously admitted being a fan of Rage Against the Machine (though the band quickly rejected his affections), and I can totally see him getting pumped up for a big vote by listening to their 2000 version of "Renegades of Funk."
Granted, when the singer goes off about Chief Sitting Bull, and Malcolm X, and whatnot, Ryan probably mentally substitutes names like Jack Kemp and Art Laffer.