These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Award Snub: He was nominated for fourteen Grammys, but only won three—all of them in the Gospel category. Two of them for the same song.
Covered Up: "Hound Dog" was originally performed by blues singer Big Mama Thornton.
"Blue Suede Shoes" is another one; it was actually a big hit for Carl Perkins before Elvis' own version was successful.
Presley was also late to the party in recording "Shake Rattle and Roll"; his version actually combines elements of the previous hit versions by Joe Turner and Bill Haley (Turner's lyrics, Haley's arrangement).
Later in his career there was "Suspicious Minds" (originally written and recorded by Mark James) and "Burning Love" (first recorded by Arthur Alexander).