To learn U2 - (From How To Dismantle An Atomic Bomb sessions) Smile chords, these are the chords to practise in sequence: A, F#, A, E, A, E, F#m and A. For best results, commence at 53 BPM and progress to the song's BPM of 107. Considering the song's key of E Major, position your capo to suit your vocal and chord preferences.