 For these chords, he often plays the same notes on multiple strings, some which are left open, creating an Irish-influenced drone.Against this drone, he changes other notes to imply a harmony.Among the Edge's signature techniques are playing arpeggios, sixteenth note percussive strumming, and harmonics, the latter of which he described as "so pure and finely-focused that [they have] the incredible ability to pierce through [their] environment of sound, just like lightning".