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Lyrics for traditional American folk songs and African-American spirituals are often changed, improvised and traded between songs by different artists and at different performances. This was and is especially true in the call and response of African American religious music. For example, Mahalia Jackson, in her 1958 performance of "Keep Your Hand on the Plow", begins with the couplet ""Mary had three links of chain, Every link bearin' Jesus name"." Bob Dylan also sings these lyrics in his upbeat version of "Gospel Plow." Carl Sandburg, in his 1927 book "The American Songbag", attributes these lyrics to yet another song entirely, "Mary Wore Three Links of Chain." Modern choral arrangements of this song sound entirely different from either the Eyes-Prize or Hand-Plow songs. Both Sandberg in the preface to his book and folk singer Pete Seeger in the opening remarks to his Carnegie Hall performance of "Keep Your Eyes on the Prize" note the malleability of American and African-American folk music. No one artist can be historically credited with "Keep Your Eyes on the Prize."