On this Day May 31, 1968
Origin of article http://www.thisdayinmusic.com/onthisday.php?factid=14879
Working on what will become The Beatles added overdubs of bass and vocals on Revolution. After numerous overdubs have been added, the final six minutes of the song evolved into chaotic, jamming, with Lennon repeatedly shouting “alright” and Yoko Ono speaking random phrases. The jam becomes the basis for Revolution 9, and this session is the first that Yoko attends.