Best Friend by Jason Mraz is in G at 85 beats per minute and runs 3:15 across 36 bars. It uses 6 chords — G, C, Fsus2, Am7, D7, G7sus. 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? Best Friend guitar melody tab.