Crown Imperial was composed for the proposed coronation of King Edward VIII in 1937, but as he abdicated in 1936, the first performance of this march was for the coronation of King George VI in 1937.
This march was written by a certain composer (one of my favourites - especially the ‘cello concerto and his songs, but this puzzle is not about those!) who has an interesting story of how his musical career started.
His father, who was a singing teacher and organist in Oldham, saw an advertisement in the local paper for voice trials for probationer choristers for Christ Church Cathedral School, Oxford. He applied, knowing that his son had shown early musical promise. However on the night before the boy and his mother were due to travel to the audition in Oxford, his father drank away the money for the train fare in a pub 
. His mother asked the local greengrocer to lend them the money, which he did, so they did make it to Oxford, although arriving after the trials had finished. She pleaded with them to hear the young boy, and she succeeded so he was accepted into the choir. He then went on to have a successful composing career spanning 60 years, writing in several styles, from film music to opera.
So this puzzle is by way of a thank you for all good neighbourly deeds - you never know where they will lead 
Answer the following questions, then plot the final location:
A = Number of letters in the composer’s first name
B = Number of letters in his father’s middle name
C = Number of letters in his mother’s maiden name
DEFG = The year the family saw the advert for probationer chorister trials
H = Number of letters in the composer’s name of the piece of music the boy sang for the trial.
N 50° 49.(H-C)(E-B)G
W 000° 22.(E-C)(A-G)(F-D)