From the Wikipedia entry:
Back to the Egg is the final studio album by Wings and was released in 1979. It is also notable for being leader Paul McCartney's first album for Columbia Records after leaving long-time US distributor Capitol Records in 1978.
By the end of June 1978, this last incarnation of Wings settled into Spirit of Ranachan Studios on McCartney's farm in Scotland, then moved onto Lympne Castle near Hythe in Kent (not far from McCartney's new home in Peasmarsh, near Rye, Sussex) in September and Abbey Road Studios in October, where McCartney organized a special one-off session. On 3 October, Wings recorded two tracks, "Rockestra Theme" and "So Glad To See You Here" with many celebrity guests under the heading of Rockestra. Hank Marvin of The Shadows, The Who's Pete Townshend, Pink Floyd's David Gilmour, Led Zeppelin's John Paul Jones and John Bonham (in one of his last performances) all took part.
Unfortunately, the critical reaction was not warm upon the album's release. Considered uninspired and directionless by many of its reviewers at the time - and to this day, Back to the Egg also sold beneath expectations, reaching #6 in the UK and #8 in the US with relatively short chart stays, although it went platinum. Its single releases "Old Siam, Sir," "Arrow Through Me," and "Getting Closer" were also small hits. Although many McCartney fans are devotees of Back to the Eg, it is still generally considered one of his least popular albums. Wings thus began and ended their studio career with their least successful projects.
Yet again, on Back to the Egg, McCartney found himself competing against Beatle Paul. No doubt many of the critics, who at the time felt it was "uninspired and directionless," had anticipated work comparable to his Beatles-era output, which obviously (in hindsite) was impossible. But it isn't bad, in fact, it's among my favorites of what Paul has done post-Beatles. I can remember walking into record stores, seeing entire walls covered with nothing but copies of Back to the Egg. Promotional videos were made for nearly every song. Here are those videos, with a 1-5 egg rating of the song (not the video), and some brief commentary/critique:
"Again and Again and Again" - Three words: Denny Laine composition
This is the live performance done at one of the Concerts for the People of Kampuchea in December 1979 (I love Pete Townshend in this):