Bono's voice 'opened up' following father's death

In an interview for NPR to promote his upcoming memoir Surrender: 40 Songs, One Story, the Irish singer-songwriter discussed his "unscientific theory" that there was a distinctive shift in his singing voice in the wake of his dad Bob Hewson's passing in 2001. He explained:, "It's kind of a folksy idea really that when someone you love passes on, there might be a gift in their passing." "My voice certainly changed... My voice opens up, and there's a physiological reason for that, too."