SMH. I think in the persuit of some profound secret to recording, people manage to overlook common simplicity.
He rapped the song the way it sounds recorded. That's why it sounds the same when you hear it live.
Put on a pair of headphones and just vibe to it.
You can tell he's layered a coulple doubles over some words he wanted emphasized. He also used delay(or manually repaeated)a few words for atmospehere of the song.
There are parts where he yells, parts where he impersonates the voice of his naysayers, ect.
This is called RECORDING.
This is why it can't be done in the living room of an apartment where neigbors will knock on the wall and tell you to shut up, or your mom will bang on your door and ask you what you're doing.
There is no "trick" or "secret" to recording good vocals. It's all in the performance. And although in 2000 that was a great mix, anyone with a daw and a $200 USB mic can achieve something close to it in 2010. If they give the equivalent performance.
Bingo. If he was rapping 4 takes, or even 2 through the whole song it would sound strange. Phasing issues, timing issues, etc.
Of course there are a few techniques they use:
-Duplicate the track twice, pan the extras to the side and process them heavily to avoid phasing
-Auotune/Pitch correction
-2 or 3 compressors, the first one mild then the second one heavier
-eq to cut some mids, boost the highs get a more agressive tone
-Comping (having multiple takes and taking the best parts of each one and making one final performance)
-If you want to be like Eminem, you gotta pretend you ARE him. shout into the damn mic, be agressive and think about something that makes you angry while you're rapping or something. One of the reasons that Em (used to) have such emotion in his tracks is because he was rapping about his kids and drugs and sh*t like that
EDIT: And pitch. Make sure to have the same pitch as Em when you're rapping. Yes, even rap has a base pitch
