As someone who grew up in the Internet's formative era, I love a good introduction.
I grew up in an era that personified personality. I watched the training theme from the Rocky movie series blast out while the Boston Celtics stood in their hallway, and I watched the New England Patriots go crazy in their tunnel before exploding out to the strains of "Crazy Train." "Enter Sandman" still makes me think of Mariano Rivera, ironic given my Red Sox fandom, and I used to dream about snarling like Trevor Hoffman to "Hells Bells."
All of those introductions contained music in some form, but the YouTube era opened the door on so many other looks behind the proverbial curtain.