In this edition of the Gramophone Podcast, Editor Martin Cullingford meets Joseph Calleja to talk about a really fascinating and very personal project - a celebration of the music of the conductor Mantovani, Britain's most successful album artist before the Beatles and the first to ever sell a million stereo records worldwide. On his new album for Decca, the tenor sings to Mantovani's historic and much-loved recordings - he explains how this project came about, and how they made it work.