Two absolute classics from Atlantic's first queen of R&B, the one and only Ruth Brown. 'Mambo Baby' rode the mambo craze like few other records could, hooking you right in from the shuffling bass and piano pattern of the opening bars. And when Miss Brown joins in with her typically self-assured, sassy and sexy squealed vocals, any resistance is truly futile - this is in the territory marked 'R&B perfection'. As indeed is '5-10-15' hours on the flip side, one of Brown's signature songs, and another of the finest recordings of the entire 1950s.