This is in the Key of Bb or the Relative Minor Gm.
All 'Bb' will be the Do, and all 'G' will be the La... using Do Re Mi Fa So La Ti Do.
The Last Line is surprising easy to read... which prompted me to Blog this. You must try this.
"in his ri-sing to new life: Re-joice..."
"Do Re Mi-Re Do Ti Do To Do......"
Here is the whole Song if you want to try it: