Westminster Quarters

The Westminster Quarters, from its use at the Palace of Westminster, is a melody used by a set of four quarter bells to mark each quarter-hour. It is also known as the Westminster Chimes, Cambridge Quarters, or Cambridge Chimes, from its place of origin, the Church of St Mary the Great, Cambridge.

Description

The Westminster Quarters are sounded by four quarter bells hung around Big Ben in the Elizabeth Tower belfry, in the Palace of Westminster. These are:

Quarter bell	Pitch	Weight	Diameter
First	G₄	1.1t	1.1m
Second	F₄	1.3t	1.2m
Third	E₄	1.7t	1.4m
Fourth	B₃	4.0t	1.8m

The quarters consist of five changes, permutations of the four pitches provided by these quarter bells in the key E major. This generates five unique changes as follows:

G₄, F₄, E₄, B₃
E₄, G₄, F₄, B₃
E₄, F₄, G₄, E₄
G₄, E₄, F₄, B₃
B₃, F₄, G₄, E₄

Each of the five changes is played as three crotchets and a minim and are always played in the sequence 1, 2, 3, 4, 5. This sequence of five changes is used twice every hour as follows:
The number of changes used matches the number of quarter hours passed.
Because the five changes are used twice, and in the same sequence, the mechanism that trips the hammers needs to be programmed with only five changes instead of ten, reducing its complexity.
Both the third quarter and the full hour require the fourth quarter bell, B₃, to be rung twice in quick succession ; too quick for the hammer to draw back for the second strike. To address this, the fourth quarter bell is equipped with two hammers on opposite sides and becomes, effectively, a fifth bell for the mechanism to play.
The first and third quarters finish on the dominant, B, while the half and full hours finish on the tonic, E, producing the satisfying musical effect that has contributed to the popularity of the chimes.
The following sounds have been recreated as MIDI electronic files and do not necessarily represent the actual sounds of the bells and that the pitch of the Big Ben clip is closer to F than E in modern concert pitch. An actual recording may be heard in the summary section above.

First quarter:

Words associated with the melody

The prayer inscribed on a plaque in the Big Ben clock room reads:
The conventional prayer is:
An alternative prayer changes the third line:
A variation on this, to the same tune, is prayed at the end of Brownie meetings in the UK and Canada:

History

The Westminster Quarters were originally written in 1793 for a new clock in Great St Mary's, the University Church in Cambridge. There is some doubt over exactly who composed it: Joseph Jowett, Regius Professor of Civil Law, was given the job, but he was probably assisted by either John Randall, who was the Professor of Music from 1755, or his undergraduate pupil, William Crotch. This chime is traditionally, though without substantiation, believed to be a set of variations on the four notes that make up the fifth and sixth bars of "I know that my Redeemer liveth" from Handel's Messiah. This is why the chime is also played by the bells of the so-called Red Tower in Halle, the native town of Handel.
In 1851, the chime was adopted by Edmund Beckett Denison for the new clock at the Palace of Westminster, where the bell Big Ben hangs. From there its fame spread. It is now one of the most commonly used chimes for striking clocks.
According to the church records of Trinity Episcopal Church, this chime sequence was incorporated into a tower clock mechanism by E. Howard & Co., Boston, Massachusetts. The clock and chime in Trinity's steeple base was dedicated in December 1875. It holds the distinction of being the first tower clock in the United States to sound the Cambridge Quarters.

Other uses

A London Symphony by Ralph Vaughan Williams incorporates the half-hour changes, 2 and 3, near the beginning of the work and the first three changes of the hour, 2, 3 and 4, near the end.
Light music composer Eric Coates incorporated the music into "Westminster", the Meditation and second part of his London Suite.
"The Westminster Waltz", a light orchestral piece by Robert Farnon uses the music of the chimes.
The theme music by Ronnie Hazlehurst for the satirical TV series Yes Minister and its sequel Yes, Prime Minister, about a British politician and his interactions with the civil servants who nominally serve him, is largely based on the chimes. When asked in an interview about its Westminster influence, Hazlehurst replied, "That's all it is. It's the easiest thing I've ever done."
A piece called Carillon de Westminster based on the chimes was written for organ in 1927 by the French composer and organist Louis Vierne. It alters the order at certain points and introduces a new variant of chime 3.
A composition based on the chimes was written in the ladrang form for central Javanese gamelan. It is named variously as ladrang Wesminster, ladrang Wesmister, ladrang Wèsmèster, etc.
Indonesian train stations play the chimes as a sign of train departures and arrivals. Upon arrival, the chimes are looped continuously until departure, which may last up to 15 minutes.
Most schools in Japan and East Asia play the chimes to signal the end and beginning of classes.
For the millennium New Year, a recording of the clock was released by London Records in 1999, titled "Millennium Chimes", with the artist labelled as Big Ben. It reached number 53 on the UK singles chart for the week ending 8 January 2000.
In the United States, electronic storm sirens commonly use the Westminster full-hour chime in place of a siren tone for regular tests to avoid confusion among the public.
The chimes are used when the player reaches 6 a.m. in some of the Five Nights at Freddy's games.