Bach changed the nature of music. Beethoven changed the nature of music. Wagner tried to but hit a dead end. A good few medieval, renaissance and other baroque chaps had a massive influence. Mozart changed opera forever. Beethoven was influenced by Palestrina and Handel. Haydn was the father of the symphony. One thing about all those guys is that they are all dead this last two hundred years or more (well, a tad less in the case of Wagner and Beethoven) but you've heard of all of 'em. Can probably hum a good few of their tunes, and their stars are not at all fading. I reckon we'll be listening to The Firebird and Daphnis and Rhapsody In Blue in 200 years too. Dylan in 200 years? Well maybe. Like the Beatles. But we have their records. Ludwig never made a single record. Herbert Von Karajan made hundreds of records, lionised at the time, yet almost every single one of them sounds horribly dated already. So, who knows. The Everly Brothers are victims of fashion in a way that Elvis isn't. You never can tell. My kids love the Beatles for their lyricism, though they were both born more then ten years after the split. They've both got tons of Elvis. Love him. But play them a bit of snarlin' Bob and they think you've gone stark staring mad. They're OK with the Byrds doing Mr Tambourine Man but that's about it. He's doomed, Nobel prize notwithstanding.