Knock You Down by Keri Hilson featuring Kanye West & Ne-Yo is in Eb at 78 beats per minute and runs 4:37 across 86 bars. It uses 6 chords — N.C., Eb, F, Bb, Gm, Emaj7. 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? Knock You Down guitar melody tab.