The Orchestral Overdubs

One of the last things recorded for the upcoming "Abbey Road" LP were the orchestral overdubs with arrangements by George Martin for: "Golden Slumbers/Carry That Weight" as well as the two George Harrison compositions "Something" and "Here Comes The Sun".
For "Golden Slumbers/Carry That Weight", a final overdub on July 31 1969 in Studio 2 at EMI consisted of Paul's re-doing his lead vocal as well as overdubbed guitar and drums probably all played by Paul at this point. The orchestral recording was conducted on August 15 1969 in Studio 1.
For "Something", George Harrison also re-did his lead vocal for the song on July 16 1969 in Studio 2 of EMI with Paul on harmonies. George also re-did his guitar solo in the middle on August 15 1969 the same day as the 21 piece orchestra was added in Studio 1 as well.
Finally, handclaps were added to "Here Comes The Sun" on August 11 1969 with the orchestra overdub once again on August 15 1969. All the orchestra overdubs were done on the same day in Studio 1. The moog overdubs were added four days later by Harrison and the song was mixed for stereo on the same day as well - August 20 1969.