After a decade-plus hiatus, Sir Paul revives his low-profile, weed-scented collaboration with superproducer Youth (U2, the Orb), retrofitting their abstract electronica with good ol' psychedelic rock for the ex-Beatle's headiest music in years. "Nothing Too Much Just Out of Sight" throws "Helter Skelter" hollering over electric blues. "Two Magpies" joins "Blackbird" in McCartney's folksy aviary;...

Throughout his career, Paul McCartney has occasionally ventured into atypical musical genres anonymously or under an assumed name. In 1974, under the guise of the Country Hams, McCartney and Wings released the single "Walking in the Park With Eloise" (a number written by McCartney's father), while 1977 saw the release of an instrumental version of McCartney's Ram album as recorded by "Irish...