I Will Always Love You is technically a Dolly Parton song, but good luck telling anyone's mum that.
Fun fact: She was the first artist to chart seven consecutive number-one singles on the Billboard Hot 100.
Played a right-handed guitar upside down and left-handed, and still made everyone else look amateur.
Fun fact: He served as a paratrooper in the 101st Airborne Division before becoming a professional musician.