Good songs to be used as a choral arrangement?

[Chibi_Venus]

A little background first...

I was inspired to make this thread after being at a certain choir performance all day yesterday. The pieces we performed are all pure choir performances. No Broadway, nothing that's a pop song made into an SSA, SATB, or SAB arrangement.

Example of a song can be seen here. Actually, we performed this piece last night (I personally LOVED it).

So what Ayu songs can you see or imagine being made into a beautiful choral arrangement (SSA, SATB, SAB, etc)?

I think superior examples would be "M" (a church/religious-themed song), "Pride" (because of its already arranged background/choir), and "Who..." (similar to "Sing Me to Heaven" and because of its lyrics).