'Into the Unknown' from Frozen 2
I wasn't a fan of Idina Menzel's voice in the original Frozen. There, I said it. Please don't send me hate mail. I thought 'Let It Go' was an average song at best with vocals that fell flat at a bunch of points throughout. I know, Iknow, "How can you say that about a Broadway star like Idina Menzel? You're an idiot!" Call me what you want but there are TWO jokes / references in Frozen 2 to Idina Menzel being flat and / or pitchy in the first movie. If you've seen the movie then you know what I'm talking about but if you haven't - I certainly won't spoil it for you here.
All that to say that I absolutely loved the song 'Into the Unknown' and she was bang-on from beginning to end! I think that the key for 'Let It Go' was right at the top of her range and when you have to sing it over and over again on the world stage - it can get a little tough.
If you stuck around until the credits of Frozen 2 then you no doubt heard Brendan Urie's version of 'Into the Unknown' which is also pretty amazing. But if I had to pick one - I'd go with Idina on this.
PS - seriously, please don't send me hate mail :)