To learn A.R. Rahman, Unni Menon - (Male) Kannukku Mai Azhagu chords, grasp the musical fabric of the song with this sequence - Bm, F#, C#, F# and G#m of chords. A good strategy is to initiate at 40 BPM and then accelerate to the track's regular speed of 81 BPM. Align the capo with your vocal depth and chord choice, bearing in mind the song's original key: F# Major.
