Let's start jamming Pentatonix - Havana chords, practice the chord sequence D, Bb, Gm, D, Gm, Bb, Dm and Gm. I suggest starting at a calm pace of 57 BPM, and as you gain confidence, approach the song's BPM of 114. To match your vocal range and chord inclination, adjust the capo in line with the key: G Minor.