Augmented Sixth Chords: Favorite Examples from Mozart and Haydn

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Richard Atkinson discusses his favorite examples of augmented sixth chords from four mature masterpieces by Mozart and Haydn: Mozart’s G minor piano quartet, K. 478, Haydn’s C major string quartet, Op. 54 No. 2, Mozart’s C major string quartet, K. 465 (“Dissonance Quartet”), and Haydn’s Symphony No. 86 in D major. This is a fair use educational commentary that uses small excerpts from the following performances/recordings:

Mozart - Piano Quartet in G minor, K. 478:
Beaux Arts Trio; Bruno Giuranna

Haydn - String Quartet in C major, Op. 54 No. 1:
Endellion String Quartet

Mozart - String Quartet in C major, K. 465 (“Dissonance Quartet”):
Quatuor Mosaïques

Haydn - Symphony No. 86 in D major:
Orchestra of the 18th Century; Frans Brüggen

00:00 - What are augmented sixth chords?
03:30 - Mozart: Piano Quartet in G minor, K. 478
06:02 - Haydn: String Quartet in C major, Op. 54 No. 1
09:13 - Mozart: String Quartet in C major, K. 465 (“Dissonance Quartet”)
15:01 - Haydn: Symphony No. 86 in D major