Okay, so I'm not a sound engineer and I probably have a bad ear as it is. I undersdtand that MP3s are substantially smaller than WAV files due in part to their compression wherein they eliminate the overtones heard in natural instruments. Now, considering that many people enjoy MP3s, I wonder how important these overtones are to your listening enjoyment.
Still, this idea of overtones being missing brings up a question in regards to GPO productions being saved as either WAVs or MP3s before being burned to CD. Do the Garritan instruments produce overtones that would be lost in an MP3 file compression?