In Béla Bartók's piano piece, "Diminished Fifth" from "Mikrokosmos", octatonic collections form the basis of the pitch content. In mm. 1–11, all eight pitch classes from the E diminished scale appear. In mm. 1–4, the pitch classes A, B, C, and D appear in the right hand, and the pitch classes E, F, G, and A are in the left hand. The collection in the right hand outlines the first four notes of an A minor scale, and the collection in the left hand outlines the first four notes of an E minor scale. In mm. 5–11, the left and right hand switch—the A minor tetrachord appears in the left hand, and the E minor tetrachord appears in the right hand.