MUSIC THEORY FUNDAMENTALS - Chapter 9, Exercise 3 Solution
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Is A-B-A-C-A-D-A Still a Genuine Rondo?

PROBLEM
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A rondo is described as having sections A-B-A-C-A-D-A. Using this
chapter's own real ABACA naming logic, explain whether this is still a
genuine rondo, and what makes the refrain (A) structurally different
from every episode (B, C, D).

SOLUTION
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Yes, A-B-A-C-A-D-A is still a genuine rondo. This chapter established
that "ABACA" names the general real PATTERN of a rondo - a recurring
refrain alternating with contrasting episodes - not a strict, fixed
limit on exactly how many episodes may appear. The chapter's own real
examples already included longer variants like ABACAB and ABACABA
alongside the basic five-part ABACA form, confirming that additional
episodes (here, a third one, D) simply extend the same underlying
pattern rather than breaking it.

What makes the refrain (A) structurally different from the episodes:

    - A recurs multiple times throughout the piece (here, four times),
      each time bringing back the same (or very similar) musical
      material, anchoring the listener's sense of "home."
    - Each episode (B, C, D) appears only ONCE, introducing genuinely
      new contrasting material each time it shows up.

ANSWER: A-B-A-C-A-D-A is a genuine rondo - simply one with three
episodes instead of two. The refrain (A) is structurally different from
every episode because it is the single, recurring, identity-defining
idea the listener keeps returning to, while each episode is a one-time,
unique contrasting excursion away from it.

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WHY THIS WORKS AS AN ANSWER

This directly applies the chapter's own stated real variation list
(ABACAB, ABACBA, ABACABA) as evidence that the rondo pattern is genuinely
flexible in episode count - the defining feature isn't a fixed number of
sections, but the specific alternating relationship between one
recurring refrain and any number of one-off contrasting episodes.