The Musicarta Canon Project

Transposing the Canon Chord Sequence
- Module Four -

This is the last module in the Musicarta Canon Project transposing mini-series. To get the most out of it, you should have worked through the main Canon Project as far as Module Seven and have finished the other three transposing modules.

We will use the B strain of Canon Diaries 12-05-12 to devise an exercise which will give you invaluable practice modulating and playing the Canon chord sequence in different keys.

Transposing Module 1

Transposing Module 2

Transposing Module 3

Transposing Module 4

Modulating

The CD 12-05-12 B strain is in F and uses these chords.

CPT_T4_01

The first six chords are the Canon chord sequence chords in F; the last two are different.

Here are the chords in the Roman numeral system.

The last two chords go up tunefully from I (F) a whole tone to a minor chord ii (Gm) then up another whole tone to a major chord III (A).

In Canon Diaries 12-05-12, where this chords sequence comes from, this final III chord is the dominant (V) chord that returns us to the home key of D for the final strain.

CPT_04_02

Taken on their own, these last three chords (I-ii-III – F, Gm, A) therefore lower the key by modulating down a minor third (F major down to D).

The pattern in D

Instead of playing the usual Canon chords in D:

D - A - Bm - F#m - G - D - G - A

   (= I - V - vi - iii - IV - I - IV - V)

  we copy the pattern-in-F above and change the last two chords. 

D - A - Bm - F#m - G - D - Em - F#

   (= I - V - vi - iii - IV - I - ii - III [=V])

CPT_04_03

The F#/V chord at the end of the phrase takes us into the key of B, a minor third down from D.

There are four minor thirds intervals to an octave, so if we play this modulating sequence starting in the Canon key of D, we will drop successive minor thirds through B, A¨ and F majors playing the same sequence in each key before returning to D.

Covering all the keys

Each starting tonic will take you through four keys, so three sets are needed to cover all possible keys.

  • Set 1: Start on D to play in keys D, B, A¨, F and D again, ending B¨maj7, E¨maj7, D;
  • Set 2: Start on E¨ to play E¨, C, A, G¨, E¨ ending C¨maj7, F¨maj7, E¨;
  • Set 3: Start on E to play E, D¨, B¨, GE ending Cmaj7, Fmaj7, E.

The music for these three sets is shown below and is in the Workbook. The first chord in each line of music is the tonic for that line - that is the key signature you see.

The ending

The sets ends with the ¨VImaj7–¨IImaj7–I pattern from Canon Diaries 12-05-12.

CPT_04_04

Set 1

Keys D, B, A¨, F and D again, ending B¨maj7, E¨maj7, D 

CP_Trans_S1

Set 2

Keys E¨, C, A, G¨ and E¨ again, ending C¨maj7, F¨maj7, E¨ 

CP_Trans_S2

Set 3

Keys E, D¨, B¨ G and E again, ending Cmaj7, Fmaj7, E 

CP_Trans_S3

Modulating in the RNS

Changing key in the course of a piece is called modulating.

Pop songs often modulate – both for dramatic, musical effect and to sweeten  repetition for the listener. Sometimes only a section is in the new key and the song modulates back, and sometimes the song or piece ends in the new key.

In music theory, modulation is traditionally notated using the Roman numeral system, like this (the first modulation in Set 1, D to B):

The overlap shows the modulating chords (E minor and F# major) written in both keys – as ii and III in D, and as iv and V in new key B major. The overlapping chords are called ‘common chords’ or ‘pivot chords’.

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