I Heard It Through The Grapevine by Marvin Gaye is in Em at 120 beats per minute and runs 2:16 across 32 bars. It uses 6 chords — N.C., Em, A, B, A7, C#m. 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? I Heard It Through The Grapevine guitar melody tab.