If you listen to Chainsmokers, you'll probably relate to a lot of what this video is saying.
The repetitive piano chords, the same songs about the same things - it's not just a problem with Chainsmokers, but it's something that's prevalent in a lot of commercial pop music nowadays. In fact, you could break down a Chainsmokers song in less than five minutes - which is exactly what John Fassold decided to do.
The singer-pianist basically replicated a Chainsmokers song from scratch and, to be honest, it doesn't sound bad. If anything, it actually sounds better than them.
Take a look.