# Borrowed Chords & Modal Mixture, Music theory

The Neapolitan, augmented sixths, and parallel key borrowing

Modal mixture covers borrowed chords from parallel keys, the Neapolitan chord (♭II), and the three augmented sixth chords (Italian, French, German) that appear throughout string quartet writing from Haydn to Brahms.

Advanced · 5 lessons · approximately 93 minutes of material (not a mastery deadline).

## Before this module
- [Modulation Techniques](/learn/theory/modulation), Pivot chords, chromatic shifts, and key-to-key navigation

## What this module covers
1. **Borrowing from Parallel Keys**, When C major reaches into C minor for a darker chord (24 min)
2. **The Neapolitan Chord**, ♭II, the flat-two chord and its striking sound (24 min)
3. **Augmented Sixth Chords**, Italian, French, and German, three variants, one function (15 min)
4. **Modal Mixture in String Quartet Writing**, Haydn, Brahms, and Schubert through borrowed chords (14 min)
5. **Borrowed Chords Challenge**, Analysis and writing, identify ♭II, Aug6, and borrowed chords (16 min)

## What comes next
- [Counterpoint & Voice Leading](/learn/theory/counterpoint), Species counterpoint and independent lines in chamber music

## Where should I start with borrowed chords & modal mixture?
The curriculum places Modulation Techniques before this module. Review those topics if they are unfamiliar. The first lesson is “Borrowing from Parallel Keys”: When C major reaches into C minor for a darker chord. The order is a study guide, not proof that every learner needs the same pace.

## How long is the borrowed chords & modal mixture module?
The 5 listed lessons total approximately 93 minutes of material. That estimate describes lesson content, not the practice time needed to become comfortable with the neapolitan, augmented sixths, and parallel key borrowing. Revisit one task at a time and use feedback from a teacher where physical technique is involved.

## What can I try here without an account?
The borrowed chords & modal mixture description, lesson sequence and prerequisite links are public. There is no full worked lesson sample for this module yet. The linked public tools and references are free. A free account includes the complete five-lesson foundation module in each instrument and five lessons in music theory, with saved progress and no expiry. Later lessons require the relevant paid package.

## Continue in Arco
The complete five-lesson foundation module in each instrument and five music theory lessons are free with an account, including saved progress and no time limit. Later lessons require the relevant paid package. Public samples do not assess your physical technique or certify exam readiness.

[See packages and pricing](/pricing) · [Back to the music theory curriculum](/learn/theory)

Canonical source: https://arcosounds.com/learn/theory/modal-mixture