Here's a perfect example. Look at the waveform on this tune, which rocks btw. (thanks hibred) and then look at your favorite radio pop tune's wave form. You can see the compression.
They play this on 4th downs in Auburn's stadium. Imagine the most bass you've ever heard, multiplied by 10, and 87,451 people screaming and pumped up. I miss you college football. @DamageINC