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TMU131H Music Theory II: Mozart K545
Transcript of TMU131H Music Theory II: Mozart K545
--------------------------------------------------------expanding/prolonging tonic harmony-----------------------------------------
A G F E
A G F E
D has been avoided thus far, so its entrance is significant:
it signals the move to dominant harmony (it's the 5th of the G+ triad)
important chromatic passing note
between F and G (fa-fi-soh)
introduces the leading note of the new key of G+
1 4 7 3 6 2
G major: 1-473-6251
* Memorize this 'phone number':
the pattern of the root movements
in a descending 5th sequence
* This pattern is NOT a sequence of descending 5ths; what is it, and why has Mozart chosen to use it here?
Second (subordinate) theme in G major
* Not your usual choice of key for a recapitulation!
Second theme restated in the tonic key. *
* The usual choice!
(This V4/3 is secondary
in importance to I)
and so on...
m.6 = G (bass E)
m.7 = F (bass D)
m.8 = E (bass C)
How important is D?
- it's given 2 full bars
- it's given its own 'tonality'
(D minor scale, complete with
the first accidental we've seen)
2nd theme begins with
an inversion of the
original C-E-G tonic triad!
Why? Because one goal of the composer
in the Development section is to
get rid of the 'intruder' key (G+ here)
so moving in the opposite direction
from what is 'normal' i.e. ascending 5ths
(or think of it also as descending 4ths)
creates a feeling of aimlessness - by the
time A minor arrives here our memory of
G major as the 'centre of the universe'
has gone completely out the window.
One reason for his decision
might be that F could be
interpreted as the beginning
of G's descent (see m.1)
to the final C.
(with the left hand
supporting the descent
in parallel 10ths)
End of the Exposition
viio7 of V
! This D-C-B-A (descending 5th/"D2") pattern
we've heard before - in the A-G-F-E of the opening theme!
repeat 2-measure basic idea
(there's also that descending 4th pattern again, this time F-E-D-C)
(In a movement in sonata form, expect the 2nd theme to be in the tonic key)