Get your brain working; do you think
you can unscramble RASPER CLINK?
He was a singer (not a shock) ,
and what he sang was mostly rock.
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This clue is a dead giveaway. Carl Perkins, NOT Elvis Presley, wrote the song 'Blue Suede Shoes', and performed it in 1955. Elvis released his version in 1956.
This singer is Carl Perkins, who wrote 'Blue Suede Shoes' and other songs.