The song is Nessum Dorma.
This was also sung at the 2020 RNC Convention.
At the ending of the movie Sum of All Fears, the leaders of the US and Russia are signing a peace treaty.
Simultaneously, the execution of various evil people who plotted to have WW3 start is shown.
Q told us about Sum of All Fears, as the movie title appears in several Q drops.
The last lines of the song are “I will win, I will win”
The meaning is that Trump will win, and the evildoers will get their just reward soon.