It may be designed, also, as period, double-period, or phrase-group, and is somewhat likely to be a little longer (more extended) than Part One.

A concluding section (called codetta if small, coda if more elaborate) often follows, after a decided perfect cadence in the original key has definitely concluded the Part.
The following is one of the simplest examples of the Two-Part Song-form (a German _lied_ by Silcher):-- [Illustration: Example 52.

Fragment of German _lied_.] The whole embraces four phrases, and might, for that reason, be mistaken for a double-period.

But the _strong perfect cadence_ at the end of the first period (reinforced by the repetition), and the contrasting melodic formation of the second period, so separate and distinguish the two periods as to make them independent "Parts" of the whole.

It is not one "double-period," but _two fairly distinct periods_.