To learn Gfriend - (여자친구) Mr. Blue chords, anchor your practice on these foundational sequence of chords - F, Gm, Bb, F, Dm, F, Cm, Eb and Bb. Ease into the song by practicing at 59 BPM before reaching the track's full tempo of 118 BPM. To match your vocal range and chord inclination, adjust the capo in line with the key: Bb Major.