AP Music Theory Flashcards: Key Relationships: Parallel, Closely Related, and Distantly Related Keys
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
If a piece in C major modulates to a key that also has C as its tonic but contains three flats, what is the relationship between these two keys?
This is a parallel key relationship, as the tonic (C) is the same but the key signature has changed.
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If a piece in C major modulates to a key that also has C as its tonic but contains three flats, what is the relationship between these two keys?
This is a parallel key relationship, as the tonic (C) is the same but the key signature has changed.
What is a parallel key?
A parallel key is a key that shares the same tonic as the original but has a different key signature.
What are closely related keys?
Closely related keys are keys whose key signatures differ from the original by no more than one accidental.
A musical passage shifts from a key with two sharps to a key with three sharps. What term describes this relationship?
This is a closely related key, as the key signatures differ by only one accidental.
In what two contexts can key relationships be described?
Key relationships can be described in the context of both performed music and notated music.
What two elements must be compared to identify a parallel key relationship?
You must compare the tonic and the key signature of the two keys.
Define the term used for keys whose signatures differ by a single accidental.
This term is 'closely related keys'.
What is the practical significance of closely related keys in musical composition?
They are the most common keys to which a musical passage might shift.
How is the 'closeness' of a closely related key determined?
It is determined by the difference in key signatures, which can be no more than one accidental away from the original key.
What is the primary characteristic shared between two parallel keys?
Parallel keys share the same tonic note, but have different key signatures.