Everything You Ever Wanted to Know about Classical Music, Sunday 13 September 2015 9pm.
This week Catherine Bott asks, "Who are the great male voices?" And it's not just all about opera - male voices can be tenderly pure at the top end and robustly boisterous in the lower reaches.
Expect to hear the great tenors tonight in any case - Jussi Bjorling, Luciano Pavarotti and Placido Domingo.
But there's the haunting counter-tenor of Andreas Scholl and the fruity bass-baritone of Bryn Terfel.
Chanticleer, the Vienna Boys Choir, and the Hilliard Ensemble make the case for all-male vocal ensembles.