2. Double Periods Are essentially two period that work together coming to a strong cadence point The first period being the atecedent and the second being the consequence. The periods may not always be able to stand alone especially the first one that usually ends in a half cadence and so the final cadence point of the form is important that it ends the strongest.
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4. Parallel Double Periods The majority of the two periods must be similar and mirror the harmonic content of each other, with the first and third phrases being similar or identical and the second and fourth differing mostly at cadence points. It is also good to note that while the two periods must be parallel to each other, however they themselves individually may form contrasting periods making a: a b a’ b’ phrase structure.
5. Contrasting Double Periods The two periods must differ from each other, with the different harmonic structure. The periods stand alone may form parallel periods but must contrast with each other forming a: a a’ b b’ phrase structure. The two periods also may be contrasting leaving for four separate phrases tied together by cadence points with the last one being strongest. This would leave a: a b c d phrase structure.
