One of the most important piano teachers of all time, Carl Czerny's many books of studies and technical exercises cater for all levels of development. The 30 Études de mécanisme, Op. 849 were composed to prepare advancing students for the famous 'School of Velocity' in which the development of virtuoso rapidity is undertaken. This edition of Op. 849 is edited by Adolf Ruthardt and is an important part of any piano student's library.