To jam and learn O.A.R - Black Rock chords, your primary focus should be mastering these chords sequence: A, Bm, D, G, Bm, D, Bm, G, D and A. Begin your practice at a relaxed 36 BPM, then work your way up to the song's BPM of 74. With the song's key of D Major, set your capo to fit your vocal range and chord choice.