AP Music Theory

Advanced Placement Music Theory covering musical notation, harmony, and composition.

Basic Concepts

Scales and Key Signatures

Exploring Scales and Key Signatures

Scales are the building blocks of music. A scale is a sequence of notes in ascending or descending order, forming the foundation for melodies and harmonies.

Major and Minor Scales

  • Major scales sound happy and bright. The pattern of whole steps (W) and half steps (H) is: W-W-H-W-W-W-H (e.g., C major: C-D-E-F-G-A-B-C).
  • Minor scales sound sadder or more serious. The natural minor pattern is: W-H-W-W-H-W-W (e.g., A minor: A-B-C-D-E-F-G-A).

Key Signatures

The key signature tells you which notes are consistently sharp or flat. It appears at the beginning of each staff line, right after the clef.

  • Sharps or flats in the key signature help you instantly recognize the key of the piece and play the correct notes.

Circle of Fifths

The Circle of Fifths is a visual tool to understand key signatures and how closely related keys are.

Real-World Impact

Knowing your scales and key signatures means you can quickly transpose songs, improvise, and write music that sounds great!

Examples

  • A guitarist improvises a solo in the key of G major using the G major scale.

  • A composer chooses E-flat major for a warm, mellow sound in their piece.

In a Nutshell

Scales and key signatures help musicians understand the structure and tonality of music.