Learn the basic chords of Gal Costa - O Amor chords, with this master sequence: C#m, F#m, C#m, F#m, D, A, D#, D, B, E, A, F#m, C#, F#, Bm and E. I suggest starting at a calm pace of 58 BPM, and as you gain confidence, approach the song's BPM of 116. Considering your vocal pitch and chord choices, adjust the capo in accordance with the key: A Major.