To learn Nicolás Urcelay - Martha chords, these are the chords to practise in sequence: Am, Ab, Gm, Am, Ab, F, D, G, C and F. To master the tempo, it's wise to start at 61 BPM before aiming for the song's 122 BPM. Align the capo with your vocal depth and chord choice, bearing in mind the song's original key: C Minor.