There are characteristic chord progressions taught in music theory, for example, the cadential 6-4, which is Ic - V - I. Then there's Ib - ii7b - V - I, & so on. I want to know if these cadences have to be written as is, or they can be modified by writing one or more chords in them in an inversion?

Also, from a previous question asked by me (double the third or the fifth of a chord), I learnt that notes other than the root are also doubled. I want to know if this is ok to do in the cadences I mentioned above (& other examples of such characteristic cadences). For example, is it ok to double the third instead of the root in chord Ib of the Ib - ii7b - V - I progression?

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    Are you using "a, b, c" to denote inversions? Because the "b" is easily confused with "♭"... – user45266 May 13 '19 at 17:07
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    Without any context, it’s ok to do anything you want to do. Are you trying to ask what is or was a popular practice for some particular style of composition? If so, what style? – Todd Wilcox May 13 '19 at 23:16
  • @user45266 Yes, the "b, c..." was to denote inversions. – Grace May 14 '19 at 3:22
  • @ToddWilcox Yes I would like to know it especially for harmonising a chorale in the style of Bach, & harmonising hymns. Also, would the practice change depending on the style of music you want to write for? – Grace May 14 '19 at 3:26

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