Mercy On Me by Christina Aguilera is in Am at 120 beats per minute and runs 4:14 across 86 bars. It uses 5 chords — Am, Dm, E7, N.C., 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? Mercy On Me guitar melody tab.