To jam and learn 방탄소년단 - (BTS) Butter chords, your primary focus should be mastering these chords sequence: Eb, Fm, Db, Eb, Db, Ab, Db and Fm. For a smooth transition, initiate your practice at 55 BPM and gradually match the song's pace of 110 BPM. Fine-tune the capo based on your vocal range, ensuring it complements the key of Ab Major.