There are musicians, great musicians, and even Legends, but none have ever kept me so entertained as KHS, with his fantastic and diversely talented group of friends creating amazing videos of both unique compositions and covers of some of the best artists ever to perform on a stage.
Sam Tsui and Casey performing a mash-up first introduced me to this wonderful group of people that seem to a never-ending talent pool to keep stretching the boundaries of real entertainment, not simply covering a song, but recreating the experience from scratch to often better the original experience.
Anyone who has not enjoyed at least one of Kurt & Crews creations is missing out in a very big way.
King of Mash-up is a misrepresentation, as the creative talent of this truly amazing guy is far beyond that, but it's a great start