Was just thinking about this, and would be interested to hear what you all think.
There are loads of pieces that I find hugely moving. I was thinking back to when I watched Dunkirk at the cinema, and I found the version of Nimrod played on the soundtrack really moving. I (and most of the audience, I think) were crying a little bit by that point. I also absolutely love I vow to thee my country, although I know people think it's a bit controversial. I think it's probably my favourite hymn.