That's nothing to do with comrpession to get it onto the CD
that's the mastering process where everything is compressed so every part of the sound wave is the same "loudness" and it's still going on to this day. It leads to all songs having no dynamic balance.
( Bazongaloid, Mon 2 Jul 2012, 11:06, 1 reply, 13 years ago)

That was roughly what I was about to reply to Kroney above
This picture show the same audio, the top one is compressed, the bottom one is the original file:

( tangledupinblue hairy badge with moving eyes, Mon 2 Jul 2012, 11:11, Reply)

The top one looks like a Gallagher eyebrow

( sporters I’m sincerely gratitude to you, Mon 2 Jul 2012, 11:13, Reply)

The whole of Death Magnetic was slightly over compressed.
Which is annoying.
( Bazongaloid, Mon 2 Jul 2012, 11:14, Reply)