Meet four sisters from an unpretentious background whose dreams and ambitions changed the face of group singing for decades to come. Jean, Ann, Peggy and Mary had their sights set on sharing their extraordinary family blend with the world during the War years and none of them had any idea how far it would take them.

The Vocal Heritage Project invites you into the lives of some of the greatest jazz and studio vocal legends of the 20th and 21st centuries, tracing the evolution of vocal music and discovering what it takes to be one of the Greats.