My mother was a big fan of the Man in Black, so I heard his music from as far back as I can remember:
When Social Distortion covered Johnny Cash, I developed a new found respect for him (embedding is disabled, so I hope you will click on this link to YouTube):
"Walk the Line" and "Ring of Fire"
The movie about his life, Walk The Line, was as good as any biopic that I have seen, but it is this music video of Johnny Cash doing a cover of Nine Inch Nails "Hurt", which became my favorite. He truly made the song his own:
ADG