Let It Go by Pentatonix is in Em at 126 beats per minute and runs 3:41 across 98 bars. It uses 34 chords — Em, Csus2, D, Asus, Am, A, C, Dsus, and a few more. 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? Let It Go guitar melody tab.