Wie zongen "War is over" van John Lennon nou echt?

In deze tekst van http://en.wikipedia.org/wiki/Happy_Xmas_(War_Is_Over) staat dat Yoko Ono niet meedeed aan de demoversie, maar wel de belangrijkste vocalen van de definitieve opname verzorgde, samen met John Lennon.

"Recording

In early October 1971, with not much more than bare-bones melody and half-formed lyrics, Lennon recorded an acoustic guitar demo of "Happy Xmas (War Is Over)" in his rooms at the St. Regis Hotel in New York City where he and Ono were living at the time. Ono would receive co-writing credit, but the actual extent of her contribution at this initial stage is unclear since she did not participate in the demo, which was atypical of their collaborations. Another demo of the song was made in late October, after the couple had taken an apartment in Greenwich Village. As with his previous two albums, John Lennon/Plastic Ono Band and Imagine (released in the U.S. just several weeks prior), Lennon brought on Phil Spector to help produce. The first recording session was held the evening of Thursday, 28 October, at the Record Plant studio. After the session musicians—some of whom had performed at one time or another as members of the Plastic Ono Band—laid down the basic instrumental backing and overdub tracks, Lennon and Ono added the main vocals. One of the four guitarists needed to fill in for Klaus Voormann on the bass when his flight was delayed out of Germany. Ono and the session musicians recorded the single's B-side, "Listen, the Snow Is Falling", the following day. The Harlem Community Choir—featuring thirty children, most of them four to twelve years of age—came to the studio on the afternoon of Sunday, 31 October, to record backing vocals for the counter-melody and sing-along chorus. Photographs for the original sleeve cover were also taken during that session by Iain Macmillan."

Waarschijnlijk zong Yoko Ono vroeger beter (of anders) dan tegenwoordig.