All the music have been replaced by songs of the band Within Temptation.
This time it’s still metal songs, but less agressive, more symphonic.
And the voice of the lead singer, Sharon Den Adel, fits well the fact that two of the main characters are females.
I also think that Underworld III is actualy one of the few prequels that should be watched before the original movie.
In the first Underworld we see some flashbacks that, more or less, tell us the story of Underworld III.
So better start with the prequel and remove the flashbacks related to those events.
Most of them re edited of shortened.