Click to open full image.
 
I recorded backing vocals to chorus parts of a song. There were only me and the lead vocalist in the studio but we needed BIG [man] choir. I put Sonar to loop chorus over and over and se sang it standing in every possible location in the room.
 
We had fun but what if I decided to fix each track in Melodyne... See you next year. :)

That is cool Panu. 

If it is one or two singers, I usually triple each part for normal pop songs and put four voices on a part for a bigger sound.
 
If it is a larger group (like 6 or 8 singers), two of each is usually good.
 
Sounds like your were going for a We-Are-The-World thing  which was a combination of lots of voices, a yelly singing style, and room ambience.
 
I did a weird project that was a musical stage play that told all the major stories of the Bible using new lyrics to 42 classic TV themes.  I wrote the lyircs and arranged the music and credited the composers.  Paramount would not clear their songs, so all I have is an old VS-1680 demo version that is rough and has zero Melodyne or any other editing.  (It's ten years old.)  I will share the link later though because there are some fairly good choir sounds considering we did one voice at a time on the 1680 with no way to fix anything.
 
 

 
So, singing in key was not an option?

> So, singing in key was not an option?
 
Absolutely not. There's more room between notes.

> Sounds like your were going for a We-Are-The-World thing  which was a combination of lots of voices, a yelly singing style, and room ambience.
Something like that... We sang in every possible style to fake different singers.  I said "let's sing this until Sonar drops out". It didn't. :D We did.
 

That rings a bell... one of my friends wrote a 5x part vocal harmony and then tripled each part.
 
During the mixing I uttered his name alongside many swear words(!!!)