To start learning Oscar Y La Fantasia - Preso chords, delve into these chords sequence to get the song's feel: Em, C, B, C, Bm, C, B, D and C. For a smooth transition, initiate your practice at 44 BPM and gradually match the song's pace of 89 BPM. Given the song's key of G Major, adjust the capo to align with your vocal range and chord preference.