Studio Two, EMI Studios, London
Penny Lane over-dubbing of four flutes and two trumpets and - with three of the six musicians playing second instruments, two piccolos and a flugelhorn. The four flautists were Ray Swinfield, P Goody, Manny Winters and Dennis Walton and the trumpeters were Leon Calvert and Freddy Clayton. At the same time, unbeknown to all, John was taping the musicians' between-takes conversations for his private collection. Two more rough mono mixes were made before the 7:00 pm-1:45 am session ended.
Source: The Complete Beatles Chronicles - Mark Lewisohn