Flesch's Scale System is still popular among advanced violists a century after its creation. Max Rostal revised the latest edition to make it easier to understand, offering scales and arpeggios in all major and minor keys with various rhythmic patterns for comprehensive practice. Charlotte Karman transcribed the standard work for violin into viola to help violists improve their technique with scale exercises.

Carl Flesch, a Hungarian violinist, was a celebrated soloist, chamber music performer, and teacher. He taught many famous performers and authored instructional books, and his Scale System for the violin is still in use. He owned the Brancaccio Stradivarius but sold it in 1928. Flesch lived in London during the 1930s and was later arrested by the Gestapo. He died in Switzerland in 1944.