To learn 許美靜 - 城裡的月光 chords, grasp the musical fabric of the song with this sequence - Cm, F, Bb, Gm, Bb, F, Gm, Eb, Gm and Bb of chords. Start with a comfortable 84 BPM and as you become proficient, aim for the song's BPM of 168. Fine-tune the capo based on your vocal range, ensuring it complements the key of Bb Major.