To learn Sir Neville Marriner, Academy Of St Martin In The Fields, Academy Of St Martin In The Fields Chorus, Laszlo Heltay - Requiem, K. 626. Confutatis chords, your practice should emphasize these chord progressions: Dm, G, C, F, G, E and Am. Set your pace at 74 BPM initially and then sync up with the song's BPM of 148. Align the capo with your vocal depth and chord choice, bearing in mind the song's original key: A Minor.