If you are one of these people whose throats constrict upon hearing the words "I am a lineman for the county", Glen Campbell's latest album may prove a wobbly listen. Campbell, 77, one of the lions of American popular music, has rerecorded a number of his best known songs alongside a clutch of outtakes from 2011's Ghost on the Canvas album sessions; vocal tracks that have since acquired no-fuss arrangements. Wichita Lineman and Rhinestone Cowboy, for two, are stripped down to barely more than guitar and vocal. Campbell has Alzheimer's disease and retired from touring last year. Here, he remains in fine, yet undeniably altered, voice; the power of his interpretations is undimmed even as intimacy overtakes their former lushness.