Video: J.S. Bach - The Well-Tempered Clavier, Book 1: Preludes and Fugues (performed by Sviatoslav Richter)

The Well-Tempered Clavier, BWV 846–893, is two sets of preludes and fugues in all 24 major and minor keys for keyboard by Johann Sebastian Bach. In the composer's time clavier, meaning keyboard, referred to a variety of instruments, most typically the harpsichord or clavichord but not excluding the organ.

The modern German spelling for the collection is Das wohltemperierte Klavier (WTK; German pronunciation: [das ˌvoːlˌtɛmpəˈʁiːɐ̯tə klaˈviːɐ̯]). Bach gave the title Das Wohltemperirte Clavier to a book of preludes and fugues in all 24 keys, major and minor, dated 1722, composed "for the profit and use of musical youth desirous of learning, and especially for the pastime of those already skilled in this study". Some 20 years later Bach compiled a second book of the same kind, which became known as The Well-Tempered Clavier, Part Two (in German: Zweyter Theil, modern spelling: Zweiter Teil).

Modern editions usually refer to both parts as The Well-Tempered Clavier, Book I (WTC I) and The Well-Tempered Clavier, Book II (WTC II), respectively. The collection is generally regarded as one of the most important works in the history of classical music.

J.S. Bach - The Well-Tempered Clavier, Book 1: Preludes and Fugues (performed by Sviatoslav Richter): 0:00 – Prelude No. 1 in C major 1:56 – Fugue No. 1 in C major 4:29 – Prelude No. 2 in C minor 5:47 – Fugue No. 2 in C minor 7:28 – Prelude No. 3 in C-sharp major 8:43 – Fugue No. 3 in C-sharp major 10:50 – Prelude No. 4 in C-sharp minor 14:03 – Fugue No. 4 in C-sharp minor 20:26 – Prelude No. 5 in D major 21:35 – Fugue No. 5 in D major 23:30 – Prelude No. 6 in D minor 24:56 – Fugue No. 6 in D minor 27:32 – Prelude No. 7 in E-flat major 31:13 – Fugue No. 7 in E-flat major 32:43 – Prelude No. 8 in E-flat minor 37:08 – Fugue No. 8 in E-flat minor 43:35 – Prelude No. 9 in E major 44:40 – Fugue No. 9 in E major 45:48 – Prelude No. 10 in E minor 47:41 – Fugue No. 10 in E minor 48:50 – Prelude No. 11 in F major 49:45 – Fugue No. 11 in F major 51:04 – Prelude No. 12 in F minor 53:14 – Fugue No. 12 in F minor 58:39 – Prelude No. 13 in F-sharp major 1:00:03 – Fugue No. 13 in F-sharp major 1:02:21 – Prelude No. 14 in F-sharp minor 1:03:11 – Fugue No. 14 in F-sharp minor 1:07:30 – Prelude No. 15 in G major 1:08:18 – Fugue No. 15 in G major 1:10:44 – Prelude No. 16 in G minor 1:12:42 – Fugue No. 16 in G minor 1:15:35 – Prelude No. 17 in A-flat major 1:16:46 – Fugue No. 17 in A-flat major 1:19:43 – Prelude No. 18 in G-sharp minor 1:21:07 – Fugue No. 18 in G-sharp minor 1:24:35 – Prelude No. 19 in A major 1:25:46 – Fugue No. 19 in A major 1:28:25 – Prelude No. 20 in A minor 1:29:20 – Fugue No. 20 in A minor 1:33:30 – Prelude No. 21 in B-flat major 1:34:36 – Fugue No. 21 in B-flat major 1:36:08 – Prelude No. 22 in B-flat minor 1:38:34 – Fugue No. 22 in B-flat minor 1:42:56 – Prelude No. 23 in B major 1:43:48 – Fugue No. 23 in B major 1:46:23 – Prelude No. 24 in B minor 1:54:14 – Fugue No. 24 in B minor