I thought I'd try and answer this one, as I hadn't answered one of these questions in a while. And well… I'd say that Beatles tunes are pretty high on the list (though I'm the biggest fan of versions from Across the Universe, or Sgt. Pepper Live feat. Cheap Trick, neither of which being performed by The Beatles), but probably the one song that really does it for me is Bonfire by Lamb. Many Lamb songs have that effect, particularly when I'm in the mood to listen to them, particularly if I'm in the mood to listen to whole albums rather than just my music collection on random.
But Bonfire is so powerful. I just really really like the combination of music and words.
…burn like a bright bonfire in whatever you do…