Max file compression with 7zip

[toxic]

So, quick question for you guys. Ive had 7zip archives that were fairly smaller than the actual files itselves. I dont seem to be able to do that. Ex. Ive uploaded gran turismo 2 sountrack and the 7z archive was almost the same file size as the folder.
So, share your tips and tricks with me, how can I get max compression of 7zip archives?

Anything hepful is welcome

Sent from the Intergalactic Space Arcade using a Vectrex.

[Inferno.]

Audio files are already compressed (from lossless audio quality to MP3 or whatever) so you don't gain any space saving by compressing them with WinRAR or 7zip.

[deadlegion]

Which operating system you are using?

And how is that relevant?
I suspect you're posting all over the place to boost your post count, please don't do that.