As a self taught guitar player of more than 20 years, I found myself “playing inside the box”. William was able to give me techniques and advice to drastically improve my playing. From beginners to more advanced players, William is phenomenal. I worked at a large music store in Tempe for 12 years and for the last several years William has been the only instructor I’ve sent my clients to. I don’t vouch for many people but I am more than confident vouching for William.