For those in the know, Jimmy Webb is one of the great pop songwriters of the 1960s and 70s, up there with Lennon and McCartney, Brian Wilson, Goffin and King, Holland, Dozier and Holland, and Bacharach and David. The hits he wrote for Glen Campbell alone earned him his place in the Songwriter’s Hall of Fame: ‘By the Time I Get to Phoenix’, ‘Galveston’ and of course ‘Wichita Lineman’, the dying fall of which — ‘And I need you more than want you/ And I want you for all time’ — is so perfect that I am fighting back tears...