Summer by Calvin Harris is in Em at 120 beats per minute and runs 3:00 across 43 bars. It uses 8 chords — Em, C, D, Am, G, Cmaj7, Am7, N.C.. 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? Summer guitar melody tab.