AGO Organ History & Instrument Design 3

Question 1

Which statement correctly describes the acoustic difference between flue pipes and reed pipes?

Accepted Answer

Flue pipes produce sound by air striking a sharp upper lip; reed pipes produce sound via a vibrating brass tongue against a shallot

Answer

Flue pipes use a vibrating brass tongue; reed pipes use a mouth and languid to cut air

Answer

Flue pipes are always open-topped; reed pipes are always stopped (capped)

Answer

Flue pipes belong exclusively to the Pedal division; reed pipes to the manual divisions

Question 2

The pitch designation '8'' on an organ stop indicates:

Accepted Answer

The stop sounds at unison pitch as written on the score

Answer

The stop sounds an octave higher than the written pitch

Answer

The stop sounds an octave lower than the written pitch

Answer

The stop contains exactly 8 individual pipes per note

Question 3

A 'mixture' stop on a pipe organ sounds multiple pipes per key. What is the purpose of this design?

Accepted Answer

To reinforce the upper harmonics of the tone, adding brilliance and clarity to the principal chorus

Answer

To blend two different fundamental pitches into a single tonal color

Answer

To reduce overall dynamic volume by mixing air pressure between wind chests

Answer

To combine tracker and electric action in a single unified mechanical system

Question 4

The medieval organ at Halberstadt Cathedral in Germany (c. 1361) is historically significant primarily because:

Accepted Answer

It features one of the earliest known keyboard layouts with individual keys for each chromatic pitch

Answer

It is the oldest fully functional pipe organ still in regular use today

Answer

It was the first organ to incorporate separate divisions (Great, Swell, and Choir)

Answer

It was the organ Johann Sebastian Bach used when composing his Toccata in D minor

Question 5

Why is the 'Open Diapason' (or 'Principal' in German) stop considered the foundation voice of the organ?

Accepted Answer

Its characteristic clear, full tone defines the archetypal organ sound and anchors the principal chorus

Answer

It is always the loudest stop available and dominates all other tonal colors

Answer

It must be engaged for wind to reach all other stops on the instrument

Answer

It generates the regulated wind pressure that powers the entire wind system

Question 6

The historical 'positive organ' as a standalone instrument was characterized by:

Accepted Answer

Being a small but movable instrument that could be repositioned and used in intimate settings

Answer

Being a large, immovable organ installed permanently in a church rear gallery

Answer

Serving as the main (Great) division of a large multi-manual pipe organ

Answer

Being a specialized single-stop instrument used only for improvisational accompaniment

Question 7

How does 'equal temperament' tuning differ from historical 'meantone' temperament as it applies to pipe organs?

Accepted Answer

Equal temperament divides the octave into 12 equally-spaced semitones, enabling playing in all keys without 'wolf' intervals

Answer

Equal temperament produces perfectly pure major thirds while meantone slightly narrows the perfect fifths

Answer

Equal temperament produces perfectly pure perfect fifths while meantone compromises them equally

Answer

Equal temperament was specifically developed for Baroque organs, while meantone is the modern standard