Béla Bartók's Mikrokosmos () Sz. 107, BB 105 consists of 153 progressive piano pieces in six volumes written between 1926 and 1939. The individual pieces progress from very easy and simple beginner études to very difficult advanced technical displays, and are used in modern piano lessons and education. In total, according to Bartók, the piece "appears as a synthesis of all the musical and technical problems which were treated and in some cases only partially solved in the previous piano works." Volumes one and two are dedicated to his son Péter, while volumes five and six are intended as professionally performable concert pieces. Bartók also indicated that these pieces could also be played on other instruments; Huguette Dreyfus, for example, has recorded pieces from Books 3 through 6 on the harpsichord. In 1940, shortly before they emigrated to the United States, he arranged seven of the pieces for two pianos, to provide additional repertoire for himself and his wife Ditta Pásztory-Bartók to play. Volumes The pieces progress gradually in difficulty through the entire collection, from number 1 at the beginning of volume I to number 153 at the end of volume VI. Volumes I and II: Pieces 1–36 and 37–66, beginner level Volumes III and IV: Pieces 67–96 and 97–121, moderate to advanced level Volumes V and VI: Pieces 122–139 and 140–153, professional level The list of pieces is as follows: {| width=100% |- valign ="top" |width=33%| Volume I Six Unison Melodies (I) (a) Six Unison Melodies (II) (b) Six Unison Melodies (II) Six Unison Melodies (III) Six Unison Melodies (IV) Six Unison Melodies (V) Six Unison Melodies (VI) Dotted Notes Repetition (1) Syncopation (I) With Alternate Hands Parallel Motion Reflection Change of Position Question and Answer Village Song Parallel Motion with Change of Position Contrary Motion Four Unison Melodies (I) Four Unison Melodies (II) Four Unison Melodies (III) Four Unison Melodies (IV) Imitation and Counterpoint Imitation and Inversion (I) Pastorale Imitation and Inversion (II) Repetition (II) Syncopation (II) Canon at the Octave Imitation Reflected Canon at the Lower Fifth Dance in Canon Form In Dorian Mode Slow Dance In Phrygian Mode Chorale Free Canon |width=33%| Volume II In Lydian Mode Staccato and Legato (I) Staccato and Legato (Canon) In Yugoslav Style Melody with Accompaniment Accompaniment in Broken Triads (a) In Hungarian Style (for two pianos) (b) In Hungarian Style Contrary Motion (2) (for two pianos) Meditation Increasing-Diminishing County Fair