Rounded Binary Form

OK, so now that we have explored Ternary, there is one last short form we’ll discuss:¬†Rounded Binary

In a Nutshell

Rounded Binary looks like this:

||:A:||: B A:||

Sometimes, the composer will only use a part of the A section when it returns at the end. This is sometimes written as

||:A:||:BA’:||, where the A’ is called “A prime” and means that the A section has been changed slightly.

In this case we could say the form is Bread, Bread, Cheese, Half a Slice of Bread, Cheese, Half a Slice of Bread.

Here is a listening example in the form¬†||:A:||:BA’:||

Mozart Eine Kleine Nachtmusik, 3rd movement