Plot: Jazz singer and broadcaster Clare Teal transports us back to the heady days of the swing band era of the 1930s and 1940s in a recreation of the bands of Count Basie and Duke Ellington. Conductor James Pearson of the Count Pearson Proms Band takes on Grant Windsor of the Duke Windsor Proms band in a roof-raising battle, with help from vocalists Gregory Porter and Vula Malinga