by Berkeleyan » Tue Jul 08, 2003 7:12 am
The book "The Beatles Recording Sessions" by Mark Lewiston probably has the information you´re looking for. The song you´re interested in was recorded in ´67, around the time of the " Sgt. Pepper" sessions.
If I took a wild guess, I´d say George and some fellow Beatle played the horns and added sound effects (percussion et al.)themselves...