To jam and learn Era - The Mass chords, your primary focus should be mastering these chords sequence: C, F, C, F, Gm, Bb, F, C, D and Dm. Kick off your practice at a gentle 54 BPM, then escalate to the song's tempo of 110 BPM. Align the capo with your vocal depth and chord choice, bearing in mind the song's original key: D Minor.