Bang Bang by Jessie J, Ariana Grande & Nicki Minaj is in C at 148 beats per minute and runs 2:54 across 74 bars. It uses 5 chords — N.C., C, Bb, C5, Bb5. 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? Bang Bang guitar melody tab.