Learn the basic chords of Usher - Bad Girl chords, with this master sequence: E, G, E, D, E, Bm, D, Bm, Em and D. I suggest starting at a calm pace of 44 BPM, and as you gain confidence, approach the song's BPM of 88. Given the song's key of B Minor, adjust the capo to align with your vocal range and chord preference.