Countdown by Beyoncé is in Bb at 82 beats per minute and runs 2:59 across 59 bars. It uses 14 chords — N.C., Dm, Gm, F, C, Em7, Ebm7, Dm7, and a few more. 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? Countdown guitar melody tab.