To jam and learn Thin Lizzy - (Live At The Philadelphia Tower Theatre, USA / 21st October 1977) Emerald chords, your primary focus should be mastering these chords sequence: Gb, B, Ab, B, Gb and Ab. A strategic approach would be to train at 60 BPM initially, and then accelerate to the song's tempo of 121. For a balanced pitch, adjust the capo with respect to your voice and the song's key: B Major.