What Key is "Memory" from the Cats musical played/sung in?

Question

What Key is "Memory" from the Cats musical played/sung in?

Answer 1

Bb if I remember correctly.  Think there may be a key change up to C somewhere in the song as well!

Answer 2

Actually, I think the original key is C-major and then goes up to a d-flat major for the "climax".

Of course, you can transpose it into whatever key you wish and there may be different recordings out there indifferent keys.