Is it possible to change a player's race through triggers?

[andreioplst]

I'm making a single player RPG map at the moment, and at some point in the game you are given the choice between two factions. So I was wondering if it is possible to change a player's race, or at the very least to change the background songs (in my case change them from orc to undead) for said player to better illustrate that change?

 

[Pharaoh_]

The songs are easy to change, the race is not. If you were able to switch races in-game, there would be an UI change as well, so no. You have to create plasmatic races, by manually creating the units you want (and select the said races with a Dialog).
The background songs, you can use the command "Sound - Stop Music After fading" and load songs from a list you have made, like a music list.