As of lately, I have been filling my Youtube feed with mashups of current and classic songs, and more often than not a masterpiece is created out of 2 all the way up to 5 or 6 songs. They are very creative ways of fusing together songs from genres that normally do not go hand in hand. 

For instance, who would have expected Post Malone's "Congratulations" would work well over "September" by Earth Wind and Fire? Or the vocals from "September" would work over Clean Bandit's "Rather Be?" There are a literal plethora of these things on Youtube, and they are quite entertaining when you want to mess with your friends and make them think they are hearing their favorite song but end up hearing something they would have never expected.

I give huge credit to anyone who can mix songs together in that fashion, it is a creative way to take 2 already existing things and turn them into something new.