Franz Liszt - Transcendental Étude 4 Mazeppa arranged for the first time for guitar by Ray Egea.
Your fingers should press the string with only enough force to produce the note cleanly, and no more. Start with the pressure needed to play a harmonic and slowly press until you can hear the note.
In the story, the cossack Mazeppa is punished for having an affair with a noblewoman. He is tied naked to a wild horse which is set loose. the music imitates the crazy galloping of the horse, and Mazeppa's endurance and suffering.