Today In Music History - March 7

[jpkansas]

1966: Brian Wilson releases his first solo single, "Caroline, No," the first release of the historic Pet Sounds sessions. Two months later, the PS album would appear with "Caroline, No" on it, but credited to the Beach Boys.

oldies.about.com/od/oldieshistory/a/march7.htm

[H2IZCOOL]

1955: In a little-noted but fateful development, Carl Perkins' "Blue Suede Shoes" becomes the first country song to cross over to the Billboard R&B charts.

That really IS a key factor, and a great harbinger of Elvis having the same song on the Hot100, C&W, and R&B charts at the same time.