From Bob Dearborn's The Olde Disc Jockey's Almanac, this little tidbit from 45 years ago today...
April 30, 1969…At EMI's Abbey Road Studios in London, George Harrison overdubbed a new guitar solo on the master take from the January 31 Beatles recording session for the song "Let It Be." He overdubbed another solo on January 4, 1970. The first overdub was used for the original single release, the second overdub solo was used for the original album release.
