To start learning Megadeth - Promises chords, centre your learning around these elemetal chords sequence: D, G, Eb, G, Eb, F, Eb, D, G, A, E and Gb. Kick off your practice at a gentle 76 BPM, then escalate to the song's tempo of 153 BPM. With an eye on the song's key Bb Major, set the capo that best suits your vocal range.