Here's a quick sample of my daughter using the Classic Compressor. I like the sound it has for vocals, and it is indeed, as Scott mentioned, a 'go to' plugin. Very light on resources and very stable. Great for when you are running multiple instances.

Since this is for educational purposes
I first imported the track and used the PGVocalRemover plugin to remove vocals. I narrowed the default frequency bandwidth to allow a little more of the mix through.

Then I ran a B1 LCD mic thru a VTB1 preamp and into a Delta 1010lt soundcard.
Had Michelle sing the song.
Then applied Classic Compressor and Ambience reverb to her track (note singular).
Her mother wanted her to record a few favorite songs for Mother's Day. She ran through this one in one take.. I did minimal editing to remove a few lip smacks between lines, etc.

http://audiomastering-online.com/stuff/untouchMichelle.mp3

I'll only leave this up for a day or two, for educational purposes

I do not work here, but the benefits are still awesome
Make your sound your own!