Studio Three, EMI Studios, London
The overdub of trumpets onto "Magical Mystery Tour", played by David Mason (his third Beatles session in as many months), Elgar Howarth, Roy Copestake and John Wilbraham. Each musician was paid £30: £15 for the basic session and an additional £15 because it ran over time, starting at 7:00 pm, but not finishing until 12:15 am.
Source: The Complete Beatles Chronicle - Mark Lewisohn