Mistletoe by Justin Bieber is in A at 164 beats per minute and runs 2:15 across 58 bars. It uses 8 chords — A, E, F#m, D, F#m7, C#m, N.C., C#m7. The chord diagram changes as the song plays and the words light up as they are sung, so you can strum and sing along without reading ahead.
Want the melody line note by note? Mistletoe guitar melody tab.