How to analyze chord progressions in tonal music?
I've been told that you have to analyze progressions according to the key at the end, despite how many keys/tonality that precede it. Is this true?
If a composition contains one key in long duration, but end up in another key with just a slight cadence at the last measure should it be also analyzed by its last key or should we assign The Roman Numerals according to what key it's in at the moment?
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Assuming the piece ends in the written key, it makes sense to analyse it from that standpoint. However, if it has modulated, it makes little sense. The original key signature has to be the giveaway - that's surely the key/starting point that the composer wanted, so it's the datum point.It's rather like a journey - you need to know where you are at the beginning, in order to find a route to your destination. You wouldn't find your way otherwise.
I agree with Alexander, and I think it also depends on how long you're in a different key. Full phrases and sections should likely be analyzed in their new key, but one or two borrowed chords can remain the the original key. To use Alexander's example, the C7 chord could be labeled as V7 of V (V7/V). I'm also assuming you're speaking of classical music. Jazz-wise, especially Bebop, songs tend to change keys very frequently.
Generally, you analyse music based on the key it is currently in, however there are cases where you can analyse in 2 keys at once(Specifically when modulating).
Say for Example you were in the key of C and modulated to G like so the chords could become something like:
C e am C | G e am C7 |G(now in the key of G)
In the 1st bar, you're clearly in C, but for the second you can either analyse in the key of C OR the key you are going to. Let's do that now
In C
G e am C7
V iii vi I7(note that in C, the lasy Chord should be CM7 instead)
In G
G e am C7
I iv ii V7
notice that the shared chords between C and G make this progression not only fit with G major, but actually fit better than with c major!
in notation from what I know the whole thing would likely be notated like so
C e am C| G e am C7|G
I iii vi I| V iii vi I7|I
I iv ii V
and in that case as you can see, there are 2 keys being analysed at the same time. Hope that helps :)
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