Donald Trump: 'You Can't Always Get What You Want' ... Really?

Donald Trump's speech was all fire and brimstone ... loud and confident, and that made the choice of exit music more than a little perplexing.

Trump finished big Thursday night at the RNC, and as he took his bows, "You Can't Always Get What You Want" was pumped through the arena.

It's a bizarre message after a candidate lays out his platform. But it may not be a message at all. One high-level campaign source tells TMZ, it was "just a song on the playlist."