To learn Justin Bieber - Lonely chords, your practice should emphasize these chord progressions: Bm, G, F#m, G, A, F#m, Bm, D and Bm. To build a solid grasp, start slowly at 53 BPM and then match the original tempo of 107 BPM. Configure the capo to your vocal range and chord preference, remembering the key of D Major.