I know it's a cop out answer, but Mozart was a genius among geniuses. He can make an extremely complex piece of music sound so simple that anyone, even a non musician, can appreciate it. There are so many layers to how complex it is, but if you just listen to the melody, it almost sounds trivial.
Those are the artists that I like most. Artists that can make art that both artists and nonartists can equally appreciate.
I'm an American, and I can't explain this to you. If I saw this on a receipt, I would write down on it that I'm tipping $0 because of the service fee and to consider the fee my tip.