Hey, I wrote this tutorial in InSIMenator, since it got screwed, I'll post it here.
Tools you will need:SimPE
Part one - Finding the wanted soundtrack(s):The game and its expansions each have a folder that holds packages of sounds, sim voices, special effects and more.
The folder mostly on this route:
X:\Program Files\EA GAMES\The Sims 2 ANY EXPANSION NAME\TSData\Res\Sound while the X's are for the drive where you installed the game.
The folder hold files like Voice1, Voice2 and on, and Misc and more, do not touch these, you dont want the sim sounds, we want music tracks, the different stations named files like Pop, Metal, Salsa... or the CAS, Build mode and Buy mode music.
If its an expansion it most likely will not have all the stations, only tracks added to the game represnet there.
Part two - Extracting the MP3(s):Well, thats the second and last part (few, that was very long!) first, open SimPE by either double clicking on the file on the sound folder or browsering the file in SimPE.
Lets say you want Natasha Bedingfield's Pocketful Of Sunshine in Simlish from FreeTime, we need to open the file Pop.package in the sound folder of FreeTime, by highlighting it you will have the option to extract it, save the file somewhere and you will get an MP3 file and a XML file, you only need the MP3, you can use the XML later if we want to package few MP3's together.
MP3 Packaging Information:Its not required for you to read it, you can read it if you want to know more about this subject.
To repackage few soundtracks or one sound track right click the resource list and you will have the option to add, add the wanted XML file, save it somewhere and your done.
I hope this tutorial helped you, I feel quite unawesome for posting it here, but I did it anyway