Theirs was a deceptively genteel-sounding take on the hot jazz stylings of the period, their harmonies sweet on first listen, but full of mad yet focused swing, appealingly tart sass and amazing vocal gymnastics. Yet they were loyal to The Song-"There'll Be Some Changes Made" has, to these jaded ears, never had such power while still being FUN. These songs-"It's The Girl," "I Thank You, Mr. Moon"-are of the period, and the Boswells' genius allows them to not only encapsulate their time but transcend it. Without them, there'd be no Andrews Sisters (a very poppy, "whitened" version of the Boswells), no Shangri-La's, no Manhattan Transfer, nada. Plus you get to hear some sizzling-hot solos from Joe Venuti and The Dorseys. This is essential for jazz AND pop group-vocals fans. Period.