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I'm studying 16th century counterpoint.

My book says, when writing a melody for second species, augmented 4th or augmented 5th shouldn't occur between strong beat and a strong beat.

But this is not between the strong beats isn't it ? It's past the strong beats so I assume it's fine but why is it saying this is a bad example ?

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  • The issue here is that the consecutive scale fragment spans a augmented 4th. May 1, 2022 at 11:52

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The issue here is that the consecutive scale fragment spans a augmented 4th. It forms what is called a compound tritone, and many counterpoint textbooks advise against it, as in the section below, of Schoenberg's Preliminary Exercises in Counterpoint, p. 6:

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In other words, even if the interval of a tritone is 'filled' with the notes between the 4th and the 7th, it is still to be avoided. In your example, if the note following the F were and E, there would be no problem, as the interval between the ends of the scale fragment would have been a perfect fifth.

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