Sir John Eliot Gardiner does Bach on a big scale. His cantata pilgrimage began on Christmas Day 1999. In one year he performed all 198 of the surviving sacred cantatas in 50 cities, releasing them in 27 volumes of live recordings on his own label, Soli Deo Gloria. This is testament to his energy and his enthusiasm for the work of a composer whose music has sustained him artistically, spiritually and financially for much of his life. Music in the Castle of Heaven is about Bach, but it is also an account of what it is to be an ambitious conductor. Gardiner is fully aware that showmanship and scholarship can go hand in hand and that when they do, it sells.