Conversation so far:
What are the rip offs of Hound Dog?
Rip offs of Hound Dog were songs that shared the same melody without being credited to the creator or being called covers.
WHat is significant about this passage about Hound Dog?
Two records were released that were neither cover versions of nor answers to Thornton's release, yet used a similar melody without any attribution to Leiber and Stoller.
What was the song that ripped off Hound Dog?
The first was Smiley Lewis's Play Girl.
What was the result of Smiley Lewis' Play Girl?

Question: What else is significant?
Self-contained rewrite: What else is significant about Hound Dog?