This is a song from the album The Lumineers, which has taken the Bastien household by storm. Here’s your options on amazon.com (affiliate link).
This video clip is mesmerizing and a little terrifying. It’s from a documentary called SAMSARA, which looks interesting.
This is well done. It doesn’t really go into why the wealth disparity is so big, but it does a good job of showing that it is big.