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Does anyone know what this is? I was reading a book and they mentioned this. It might be something to do with scales but I am completely unsure.

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Parallel movement in intervals is when two voices (notes) move the same distance( 2nd, 3rd, 4th, ect ) in the same direction. This can be applied to any interval including 7ths. Here is an example of parallel 7ths:

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As you can see, C to B is a 7th and then both move up a 2nd to D and C respectively which is another 7th creating parallel 7ths because of how the notes move. This happens again as D and C move to E and D and again once more as E and D move to F and E.

When interval motion is typically discussed it is in reference to voice leading, however typically 7ths and 2nds are left out of this discussion because the are considered to be dissonant and typically not allowed unless used in passing.

  • @Dom- does the kind of seventh matter, whether it's a major, minor, or a diminished? Don't think so. Although often the latter would maybe be written as a 6th, so it wouldn't be part of parallel 7ths... – Tim Nov 2 '14 at 9:31
  • @Tim The quality should not matter as it does not matter when you reference other major minor intervals like 3rds and 6ths – Dom Nov 2 '14 at 10:26
  • I was thinking of the rule of no parallel 5ths, If the fifth following a p5 is , say, a +5, is that still breaking the rule? Which I don't follow anyway! – Tim Nov 2 '14 at 10:31
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    It's definitely true however, that similar motion and parallel motion of *imperfect*—at least when they're major or minor, not so much if dim or aug—intervals is often all just conflated and called "parallel" 3rds or sixths. This is because major and minor imperfect consonances generally don't have different functions. Still, M3–m3 is technically only similar, it would have to be M3–M3 to be truly parallel. For dissonances like the seventh, who knows? I can't guess where the OP found a reference to parallel 7ths… – Pat Muchmore Nov 2 '14 at 12:03
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    @PatMuchmore I would also be interested to find out what book the parallel 7th were mentioned in and in what context. – Dom Nov 2 '14 at 14:35

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