by John BushDefinitely the most talented and arguably the all-around best jazz vocal group of all time, the Boswell Sisters parlayed their New Orleans upbringing into a swinging delivery that featured not only impossibly close harmonies, but countless maneuvers of vocal gymnastics rarely equalled on record. Connee (sometimes Connie), Helvetia (Vet), and Martha Boswell grew up singing together, soaking up Southern gospel and blues through close contact with the black community. They first performed at vaudeville houses around the New Orleans area, and began appearing on local radio by 1925. At first, they played strictly instrumentals, with Connee on cello, saxophone and guitar; Martha on piano; and Vet on violin, banjo, and guitar. The station began featuring them in a vocal setting as well, with Connee taking the lead on many songs (despite a childhood accident that had crippled her and left her in a wheelchair).Word of their incredi...