Bartók's Mikrokosmos is perhaps the 20th century's most influential set of piano pieces and one of the milestones in pedagogical piano repertoire. 

The Microcosm of String Ensemble Music provides 148 transcriptions from this series for making music for various string ensembles and graded in four volumes according to level of difficulty.

1. Elementary (first position): for three violins and cello or children's string orchestra

2. Intermediate: for three violins and cello or string quartet or junior string orchestra

3. Advanced: for string quartet and quintet or string orchestra

4. Advanced: for string orchestra