To start learning Mccafferty - Fentanyl chords, delve into these chords sequence to get the song's feel: A, G, F#, D, Bm and A. A strategic approach would be to train at 73 BPM initially, and then accelerate to the song's tempo of 146. With D Major as the song's key, tweak the capo to cater to your vocal pitch and chord likes.