Consecutive octaves can sneak in just about anywhere, so always be on the look out for them!Ĭheck for consecutive octaves between all six voice pairings, as above. This is allowed, because the parts don’t change notes.Ĭonsecutive octaves are just as bad as consecutive 5ths. an octave and a 5th) wrong ? YES, they are also illegal.Īre diminished 5ths wrong? No, but you should still avoid writing them if possible.ĭoes it count if the same notes are repeated? No, consecutives are only bad when the voices move: Sometimes the consecutives are more difficult to see: here are consecutive 5ths between the alto and bass parts:Īre compound 5ths (i.e. This means six checks between each chord: You have to check for consecutive 5ths between each voice of the harmony. Now the perfect 5th in the second chord is between the alto and tenor parts – the 5ths are no longer consecutive, because they are in different parts. We need to find another way to write one of the chords, to get rid of the consecutives: When there are perfect 5ths in the same two parts one after the other, we call them “consecutive 5ths”. In the second chord, they are also a perfect fifth apart. In the first chord, the tenor and bass parts are a perfect 5th apart.
Here are two root position chords – C major and A minor: Stay in the accepted voice ranges and don’t put more than an octave between the upper voices.Ĭonsecutives are the no.1 bad guy in figured bass! You must NEVER write consecutives.Ĭonsecutive 5ths often sneak in when there are two root position (5-3) chords next to each other. Double the third with care in other chords.ģb. Double the fifth in second inversion chords. Double any note in first inversion chords. Double the root or fifth in root position chords. The alto and tenor lines should not move about much at all.ģa. The soprano line should have an interesting melody.Ģc. NO dissonant leaps (seventh, augmented or diminished intervals), choose small intervals. You need to use them when you are harmonizing a melody, creating a bass line with figured bass, or realizing a figured bass.Ĭlick on each rule for more details about it.ġc. These rules of harmony need to be learnt.
Grade Six Music Theory - The Rules of Harmony
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