Standard (EADGBE)

 From "Dakota" to "along": and chords = Strum down on the top 2 strings, then all of them.

 "To Chaddy's awesome birthday song!": chord = DD DDD

 "Chad, Chad, Chaddy, Chad, Chad": chord = DD. chord = DUDU

 Dakota, it's your birthday and it shouldn't be bad.

You deserve the best, the gift of Chad!

 So come on lucky girl, let's sing along,

To Chaddy's awesome birthday song!

Chad, Chad, Chaddy, Chad, Chad!