To learn Mary Roos - Mein Sohn chords, these are the chords to practise in sequence: E, A, D, E, F#m, D and F#m. To master the tempo, it's wise to start at 68 BPM before aiming for the song's 136 BPM. Adjust the capo based on your vocal range and chord preference, keeping the song's key of D Major in mind.