So you know the song Back in Black by AC/DC. That's not a question, I know you know it, everyone knows it.
Anyway I taught myself the riff from it over the weekend, you know the one, you just sang it to yourself. It's a perfect riff - it sounds extremely stupid, meatheaded even, but it takes a lot of skill to play well, and they play it well every time.
The level of mastery it takes to sound that effortless, and thus to make the music sound that simple? Astonishing stuff.