How do you play the chorus of we wish you a merry Christmas and a happy new year on the keyboard?

The following are the notes for the verse:

g-C-C-D-C-b-a a a-D-D-E-D-C-b-g g-E-E-F-E-D-C-a g-g-a-D-b-C

and these are the notes of the chorus:

g-C-C-C-b b-C-b-a-g D-E-D-D-C-C-G-g g-g-a-D-b-C