"and his 1929 recording "Rock MeMama" is often cited as an early use of the term "rock"

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Not sure, but perhaps this article is very important. http://news.discovery.com/human/worlds-first-rock-and-roll-song-identified.html

<Sometime between that recording and the early 20s, according to Burns, the term "rock 'n' roll" started to leave the church and began to be used in blues and vaudeville music as a euphemism for sex. He cites as examples Trixie Smith's "My Man Rocks Me with One Steady Roll" in 1922, "Rock That Thing" by Lil' Johnson, and "Rock Me Mama" by Banjo Ikey Robinson.> --Roujan (talk) 23:57, 23 May 2012 (UTC)Reply