HE COULDN’T FINISH HIS SONG — SO 40,000 VOICES DID IT FOR HIM. Under the soft, golden lights of London’s O2 Arena, Barry Gibb began “How Deep Is Your Love.” Halfway through, his voice cracked — not from age, but from memory. And when the microphone fell silent, the crowd carried the chorus — thousands singing for the brothers who were no longer there.
When The Bee Gees released “How Deep Is Your Love” in September 1977, they didn’t...