Girlfriend by Justin Timberlake is in Ab at 92 beats per minute and runs 3:21 across 42 bars. It uses 8 chords — Ab, Cm, Db, Eb, Gm7, C7sus4, C, 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? Girlfriend guitar melody tab.