If you don't have the original PS:T on GoG, and you buy the EE version...You get a code for the original game under Extras, or something.

Does this also include the soundtrack for the original game? The soundtrack came with the original game. Just wondering if it also comes with the EE version.

Do you mean if the EE comes with a soundtrack? The answer is no because the soundtrack has be remastered.

Or do you mean if the extra copy of the original PS:T that comes with the EE comes with the soundtrack, the same thing as you had buy the original game in the 1st place? To this I don't know, but I would assume yes it come with all the extra. It would make no sense to remove the extra from the original game, the work to remove it.

Since they are selling the EE soundtrack separately it makes a lot of sense.

And it made no "sense" removing the original game from the stores too.

Unlike previous enhanced editions, you do not get code for original Planescape to keep or give away. Instead original is added automatically to your account upon purchase of the enhanced edition. If you already own original Planescape, you don't get a second copy unfortunately.

About: Planescape: Torment: Enhanced Edition includes the unaltered original version and the Enhanced Edition in one definitive collection exclusively on GOG.com. (The original version will be automatically added to your account after purchase.)

As for extras, yes, original includes the soundtrack (see attached screenshot).