The Calculation by Regina Spektor is in C at 102 beats per minute and runs 3:08 across 57 bars. It uses 9 chords — C, F, Am, Dm7, G, Dm, Bb, N.C., 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? The Calculation guitar melody tab.