 Complete the following phrase:  Walpole was a keen music lover and when in 1920 he heard a new tenor at the Proms he was much impressed and sought him out. Lauritz Melchior became one of the most important friendships of his life, and Walpole did much to foster the singers budding career. Wagners son Siegfried engaged Melchior for the Bayreuth Festival in 1924 and succeeding years. Walpole attended, and met Adolf Hitler, then recently released from prison after an 