To learn 張學友 - 回頭太難 chords, these are the chords to practise in sequence: Eb, Bbm, Fm, Db, Ab, Eb, Fm, Ab, Eb and Ab. For best results, commence at 45 BPM and progress to the song's BPM of 92. With Ab Major as the song's key, tweak the capo to cater to your vocal pitch and chord likes.