Multiple Grammy Award winner John Mayer is one of the most popular songwriters and singers on the pop charts today. He didn't even start playing guitar until he was 13, when a neighbor gave him a Stevie Ray Vaughan tape. Two years later he was playing in a band and by the age of 19, he had moved to Atlanta, quickly making a name for himself in the local coffeehouses. His reputation as a guitar player is almost as great as his reputation as a sensitive songwriter. Unlike many artists, Mayer allows live recordings of his performances and doesn't pursue legal action against those who trad…