What does "compression" like?

This is not an answer to your question, Rebbi, rather just a side-note. We all hate the compression used to affect dynamics for ipod and radio play.

Compression is also used in the recording studio and not in the negative ways that have been mentioned. A compressor would typically be used in recording Rock music to shape the sound of an instrument. For example, by applying compression to a bass drum or tom tom, you can affect the decay of the sound; if it is too boomy or has a long decay, adding a little compression can change the sound of the drum.

This type of compression along with other effects have been used creatively in the studio for many years and is a tool used by the producer and engineer. Usually you would never even know that it was being used.

Like Wildoats said. Plus if the singer is the same volume as the drums and guitar.

I've seen a few user reviews on Amazon where the reviewer says that something's wrong with the CD since he needs to keep changing the volume during the song.
I always feel like making a comment, but it might get ugly.