Which of the following represents ternary form? • AAB • ABA • AB

None of the above

To determine which of the given options represents ternary form, let's understand what ternary form is.

Ternary form, also known as ABA form, is a musical structure consisting of three distinct sections: A, B, and A. Each section typically has its own unique melodic and/or harmonic material. The structure can be represented as ABA, where the middle section (B) provides contrast to the outer sections (A).

Now, let's analyze the given options:

• AAB: This structure consists of two repeating sections (A) followed by a contrasting section (B). It does not follow the ABA form, so it is not ternary form.

• ABA: This structure consists of two outer sections (A) sandwiching a contrasting section (B). It represents the characteristic form of ternary structure, ABA, so this is the correct answer.

• AB: This structure consists of two sections, with no repetition of the first section (A) at the end. It does not meet the criteria of ABA form, so it is not ternary form.

Therefore, the correct answer is ABA.