リズム・アンド・ブルース
"It's Too Soon to Know" is an American doo-wop ballad by Deborah Chessler (1923–2012), performed first by The Orioles. It was number one on the American Rhythm and blues charts in November 1948. It is considered by some to be the first "rock and roll" song, and described by others as "the first rhythm and blues vocal group harmony recording".