I'm a huge Queen fan and Freddy Mercury is one of my favorite singers up there with Rob Halford and Sebastian Bach (anybody hear his new Angel Down??? or Frameshift2?!); not so much a Wham or George Michael fan, although I believe he's a wonderful singer and an amazing songwriter.
To answer a question that was left stranded in this thread:
To get a chorus effect you need unison notes with almost identical pitch... as the pitch differential grows, you will start to hear an oscillation with a speed equal to the frequency differential.
For example, 108Hz and 112Hz will give you an oscillating (wah/chorus) effect at 4 cycles per second (Hz). This is very helpful when tuning guitars!!
As that differential grows, it will reach a point when your ears will not hear the chorus effect but two distinct notes. That point will vary depending on the listener and frequency; a few Hz might do it with low frequencies, and 50 or 60 Hz might be unnoticeable at higher frequencies.
So try this, copy a wave into another track, detune one a few cents and voilá. Do it again, this time detune the other way...
Here's a link to a free Chorus Plugin as well:
http://ag-works.net/plugins.ch2.htm