To learn Arijit Singh - (DUET) Janib chords, your practice should emphasize these chord progressions: B, F#, C#, F#, B, C# and B. To master the tempo, it's wise to start at 43 BPM before aiming for the song's 86 BPM. Given the song's key of C# Major, adjust the capo to align with your vocal range and chord preference.