To start learning Petra - (Revival ALbum Version) How Long chords, delve into these chords sequence to get the song's feel: Bm, G, Bm, G, D, Eb, Ab, Eb, Bb, D, G and Em. Begin your practice at a relaxed 61 BPM, then work your way up to the song's BPM of 123. With the song's key of D Major, set your capo to fit your vocal range and chord choice.