If we listen to Mazeppa and Feux follets at the same time, we can understand the supreme greatness of Liszt, virtuoso composer: actually we can contemplate the whole technic of the piano concentrated in about ten minutes! If Mazeppa is the technic of powerful sound, Feux follets is a challenge of soft touch and of beautiful effects. Its mechanism represents the real difficult element of Feux follets: a sort of double trill, that defies the capabilities of the human resistance and precision. The Grande Étude No. 5 is simply a more difficult version of Feux follets (and Feux follets, the 'easier version', is often called the nightmare of piano players). The first version of Feux follets (Étude No. 5 S136) is really a more simple version of this Étude and presents also a graceful beginning and a beautiful finale.