Count On Me by Bruno Mars is in C at 176 beats per minute and runs 2:45 across 61 bars. It uses 7 chords — C, Em, Am, G, F, Dm7, Dm. 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? Count On Me guitar melody tab.