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Yes, they can be used reely but also with intent. You will see that the voice leading of the 4 parts is and the spacing work together.
Here is a list of usual or basic harmonic/chord progressions for traditional practice.
1) I can be followed by IV or V or Vi and less often by ii and iii.
2) ii can be followed by V or IV or vi and less often by I or iii.
3) iii can be followed by vi or IV and less often by I, ii or V
4) IV can be followed by V or I or ii and less by often by iii or vi
5) V can be followed by I or IV or vi and less often by ii or iii
6) vi can be followed by ii or V or iii and IV and less often by I
7) vii can be followed by I or iii or vi and less often by ii, IV or V.
We will use #1 as our example. If we are in the key of C Major. the I or "Tonic" chord will be C-E-G (a C Major chord). A typical progression might be:
I going to IV, or I going to V, or I going to the vi chord.
A less typical progression would be I going to the ii chord or I going to the iii chord but still acceptable.
Make sense?
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