there are artists that are famous without "filling up concert halls", or even having that much of a scale of an audience. success doesn't have to be this frankly obsolete and obtusely singular idea of it. for a lot of music and artists that were brought up and got popular on the internet, and for the people who listen to them, this "concert fame" is completely irrelevant. i bet that it's almost inverse for a certain kind of listener who either just doesn't go to concerts, or can't, and/or simply enjoy listening music in their own manner of comfort.