The piece the orchestra was playing as Harry and William walked through the church - Charles selected much of the music with an English focus - I know the piece just can't come up with the name. (It was used as a theme in the film Enchanted April, it's one of those lush romantic pieces that is perfect for the occasion).

SoundHound can't get it because the announcer kept up a steady banter over the top. Pausing to enjoy the music wouldn't be a bad thing.