Hollaback Girl by Gwen Stefani is in Em at 105 beats per minute and runs 2:52 across 60 bars. It uses 4 chords — N.C., C, Em, Bm. 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? Hollaback Girl guitar melody tab.