As the Prince of Wales accompanied Meghan towards the altar, where Harry was waiting, as Handel’s Eternal Source Of Light Divine played.
The spell-binding cantata was sung in Windsor Castle’s St George’s Chapel by Welsh soprano Elin Manahan and featured David Blackadder as the trumpet soloist.
Harry, speaking in the audio commentary notes for a new Windsor Castle exhibition about his wedding, said: “I was looking for something completely different and ended up stumbling across this piece of music.
“Something that epitomises the whole day, the whole feeling that I have for her, and this incredibly impactful music with no organ whatsoever, with a soloist who actually did the most incredible job, to the orchestra.
“And now, both of us, wherever we are, whatever we’re doing, we can close our eyes, listen to that music and take ourselves straight back to that moment.
“It’s a beautiful thing for both of us.”
Meghan’s father Thomas Markle was supposed to take on the symbolic role of walking his daughter down the aisle but pulled out days before the wedding for medical reasons.
The duke and duchess turned to Prince Charles and his extensive knowledge of classical music to help them select pieces for the wedding.
Meghan says in the commentary about meeting the prince: “It was really fun to spend some time going through selections with him and then there were specific choices that were made.
“We knew that we wanted to have a gospel choir, for example.
“There was a song that was very meaningful to us, Stand By Me, but we wanted a gospel rendition of it for it to really have a lot of soul and then the choice to be able to have Amen This Little Light of Mine be the song as we were walking out of the church was also very important to us.
“To really give it a sense of our personality in conjunction with something that still had a formality and sense of tradition.”
The exhibition A Royal Wedding: The Duke and Duchess of Sussex at Windsor Castle, runs from October 26 to January 6 at Windsor Castle.