The Boswell Sisters are one of the all-time great vocal groups. Much like The Four Freshmen and Ink Spots the Boswell Sisters should be classified both pop and jazz. They dominated the American charts in the pre-war years and arguably have directly or indirectly influenced almost all girl groups since. Everything with the Boswell Sisters name on it is collectable and as soon after editions go out of stock or are deleted they quickly become expensive rarities.