In the video, a young dude is listening to Billy Joel perform Piano Man.
There's a bunch of people on YouTube who listen to old music for the first time ever. My favorites are the young Hip-Hop fans hearing Ram Jam do Black Betty, for example, or finding out that the Bee Gees are actually a bunch of white guys when they watch the Stayin' Alive music video. "I KNOW THAT SONG!...whoa whoa whoa, wait...who's that Jesus-looking dude?"
You've also got your punk-rock fans falling on their pierced faces when they hear (and see) the Charlie Daniels Band sing Devil Went Down to Georgia, for example, and telling the viewers they wish they'd been born 40 years ago.
These are fun-to-watch videos and they make you feel pretty good that today's young people have so much appreciation for your favorite tunes from the 50s, 60s, and 70s. Especially when the YouTuber understands music, appreciates that the lack of technologies such as auto-tune, gives a great analysis, and excitedly asks their viewers to PLEASE recommend other songs by Aretha Franklin or The Righteous Brothers or The Who, etc.