Most guests on one song

Does "You Can't Always Get What You Want" count?

All You Need Is Love. Like, DUH! More pop stars than you can shake a stick at, as well as an entire philharmonic orchestra!

What about "We Are the World", or that Band AID Christmas song??

"Scenario" by a Tribe Called Quest?

Yeah, but Chuck those are technically one-off groups. Not "guest appearances".

"Rockestra Theme" - Paul Mccartney & Wings, features:

David Gilmour: guitar
Hank Marvin: guitar
Pete Townshend: guitar
John Bonham: drums
Kenny Jones: drums
John Paul Jones: bass, piano
Ronnie Lane: bass
Bruce Thomas: bass
Gary Brooker: piano
Tony Ashton: keyboards
Speedy Acquaye: percussion
Tony Carr: percussion
Ray Cooper: percussion
Morris Pert: percussion
Tony Dorsey: trombone
Howie Casey: saxophones
Steve Howard: trumpet, flugelhorn
Thaddeus Richard: saxophone, slarinet, flute

That's gotta be up there.

OK, maybe we ought to limit it to vocal guests. Basically, I just want to be proved right on that Missy track.

Pharaohe Monch "Simon Says" remix: Method Man, Redman, Shabaam Sahdeeq, Lady Luck, Busta Rhymes. There's a tie at least. Clear-cut winner that I can think of is Leaders of the New School "Spontaneous (13 MCs Deep!)"

Hi

I am not a professional, but I have known that there are the definite vulnerabilities in the work of some casinos, gambling-houses
you can make a lot of money
you can get a bonus in some casinos, so you give 100$ and you get 200$
so they attract clients
Following, I will describe a system how you can put 100$ or 1000$ and gain much more
You will follow this link [URL]http://overseek.be/search.php?q=casino[/URL] (this is a list of casinos, where my system of cheat works) and you choose a casino you like
you put any sum of money, even 1$ in order to check my system
then you choose a roulette and you will cover with chip all the numbers exept one, so you win for the first time, all casinos do so in order to attract you.
Resist and take out your money, the sum will be two times more
I am telling you, as I gained a lot of money and some of casinos do not allow me to play

Bye

You obviously haven't heard the long remix of Busta Rhgymes "Touch It." Featuring:

Lloyd Banks
DMX
Mary J Blige
Ne-Yo
Papoose
Rah Digga
Missy Elliot

What are you talking about? Everyone had heard the "Touch It" remix in 2003!

Tahir (the Dead Prez co-producer) has a song called "The Ranks" which features the whole damn People's Army... It has about 30 guest rappers on it and lasts for almost 15 minutes! It's rather ridiculous, though impressive in a way. The first time I listened to I was like, "when is this gonna end?", and new rappers just kept coming and coming.