Misc Christmas - Gaudete Chords & Tabs

This was sent over to me as a PDF from a friend of mine. 
I have no idea where it comes from, but we have had great fun learning to sing the parts:
Bass, Tenor, Alto, and Soprano. 
These are the chords that we played along to on the accordion whilst busking!
     Enjoy!

[ Tab from: https://www.guitartabs.cc/tabs/m/misc_christmas/gaudete_crd.html ]
A5  Am Em   Am  G  C    C     G   Am  Em
Gau-de-te   Gau-de-te   Chris-tus est natus

   Am G  Am  Em  F  G  Dm  Em A5
Ex Ma-ri-a   Vir-gi-ne Gau-de-te