Vangelis, Jimi Hendrix, Django Reinhardt, Eric Clapton, Stevie Ray Vaughan, Eddie Van Halen, Slash, Angus Young, Tony Iommi, James Hetfield, Dave Mustaine, Dimebag Darrell, Robert Johnson, and...yes: The Beatles. They are the first names that come to mind, but they are definitely not the only ones. It seems that it is not so essential to study for many years, to be able to give to the world great music ... What are/were great artists who are/were not able to read a score? "One day, while the quintet played cards, Django listened to Stephane Grappelli, Roger Chaput and Louis Vola discussing about musical scales. After a while, Django turned to Grappelli and asked curiously: What is a scale?"