Verified answer

Sarah Brightman - Pie Jesu

or one of her other songs as she has a soprana voice

Also you could look at Angel by Sarah McLachlan.

Memory from Cats has a good voice range. Others: Don't Cry for me Argentina, Music of the Night, You Raise Me Up, or Somebody to Love by Queen. I think you should showcase your soprano voice, but show you have a good range.

if you can pull off "climb every mountain" from sound of music that would really knock their socks off!