Changing by John Mayer is in C at 92 beats per minute and runs 3:25 across 58 bars. It uses 7 chords — C, F, G, Am, Dm7, Dm6, G7. 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? Changing guitar melody tab.