She came down the aisle and stopped next to Elvis, her eyes wide with disbelief.
'Johnny Cash!' she said in an excited whisper. We started laughing, but Elvis quickly hushed us and started talking to the girl. She told him how much she loved his - Johnny Cash's - records, and how she'd been to one of his - Cash's - shows. Finally, she asked. 'Johnny, would you sing me one of your songs?'
Elvis would never sing one of his own songs in that type of situation, but for this little Johnny Cash fan he dropped his voice to its lowest notes and started singing a few lines of 'Hey Porter', a song Cash had cut at Sun that seemed especially appropriate for a midnight train ride. The girl was thrilled, and even ended up with an autograph from Elvis, which read: 'Best Wishes, Johnny Cash'.
From the book: Elvis: My Best Man: My Lifelong Friendship with Elvis Presley by George Klein.
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Elvis Presley 'Introduced' Me To Johnny Cash by June Carter