Thornton's success with "Hound Dog" was followed three years later by Elvis Presley recording his hit version of the song. His recording at first annoyed Leiber who wrote, "I have no idea what that rabbit business is all about. The song is not about a dog, it's about a man, a freeloading gigolo." But Elvis' version sold ten million copies, so today few fans know that "Hound Dog" began as "an anthem of black female power." Similarly, Thornton originally recorded her song "Ball 'n' Chain" for Bay-Tone Records in the early 1960s, "and though the label chose not to release the song... they did hold on to the copyright"—which meant that Thornton missed out on the publishing royalties when Janis Joplin recorded the song later in the decade. However, in a 1972 interview, Thornton acknowledged giving Joplin permission to record the song and receiving royalty payments from its sales.
By then the American blues revival had come to an end. While the original blues acts like Thornton mostly played smaller venues, younger people played their versions of blues in massive arenas for big money. Since the blues had seeped into other genres of music, the blues musician no longer needed impoverishment or geography for substantiation; the style was enough. While at home the offers became fewer and smaller, things changed for good in 1972, when Thornton was asked to rejoin the American Folk Blues Festival tour. She thought of Europe as a good place for herself, and, with the lack of engagements in the United States, she agreed happily. The tour, beginning on March 2, took Thornton to Germany, France, Switzerland, Austria, Italy, the Netherlands, Denmark, Norway, Finland, and Sweden, where it ended on March 27 in Stockholm. With her on the bill were Eddie Boyd, Big Joe Williams, Robert Pete Williams, T- Bone Walker, Paul Lenart, Hartley Severns, Edward Taylor and Vinton Johnson. As in 1965, they garnered recognition and respect from other musicians who wanted to see them.