Yes, that's Tony Cruz of the St. Louis Cardinals walking up to the plate, the PA system serenading Busch Stadium with the disembodied hum of a coked-up Matthew McConaughey. This rules.
If you're not familiar with The Wolf of Wall Street scene in question:
No, it's okay. You don't need context. Just be aware that this is awesome and is possibly the most unique use of walk-up music ever.
(h/t to Alex Pavlovic)