Table of Contents
Section 6: Bibliography
rounded binary form
1. Rounded Binary form is simply binary form with a restatement of the A section.
2. This means that it is harmonically open, the A section ending on harmony other than tonic and requiring a B section to close the harmony back to tonic.
3. The primary difference between rounded binary form (ABA) and ternary form (also ABA), is the treatment of the harmony. The A section in ternary form is harmonically closed, so it can end the composition without alteration, since it ends with tonic. The A section of binary and rounded binary leads away from tonic and requires the B section to bring back the tonic. In rounded binary, since it ends with a restatement of A, the second A section is altered so it ends with tonic. Therefore, if it is marked with da capo, it will require a second ending device.
4. Another usual difference (and there are exceptions) between rounded binary and ternary are the characteristics of the A and B sections. The B section of the binary forms is often related in character to the A section. Sometimes it will develop a theme, for example. The B section of a ternary form is usually contrasting in character. Often this section will be in another mode or key.
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