Royal wedding: US bishop addresses questions about that sermon

US Bishop Michael Curry, who has been celebrated for his rousing royal wedding speech, said it was "a real joyful thing" to bring diversity to the ceremony.

US Bishop Michael Curry delivered what's been called an energetic address to the royal wedding. (AAP) Source: AAP

Prince Harry and Meghan Markle's wedding may have broken some royal traditions, but the Archbishop of Canterbury believes that could be a good thing.

US Bishop Michael Curry, along with the gospel choir, brought a flavour of the American bride's homeland with his rousing speech at St George's Chapel in Windsor.

Curry, the first black presiding bishop and primate of the Episcopal Church, almost stole the show with his energetic address during which he evoked Martin Luther King and spoke of poverty and injustice.

Archbishop of Canterbury Justin Welby praised the elements of the wedding which were not traditional by royal standards.

"There seemed to be very, very good responses," he said.

"It was unconventional by royal wedding standards in some ways, but it had passion and if you don't have passion at a wedding when will you have passion?"

Bishop Curry said it was "a real joyful thing" to bring diversity to the ceremony.

"It was a real joyful thing because there was a sense in which you had the fullness of the church represented in many respects," He told the Press Association.

Bringing everybody together, Mr Curry said, "happened today, in different ways, different songs, different perspectives, different worlds and all of it came together and gave God thanks".

The speech was a lengthy one, with Mr Curry appearing to tell himself to bring it to a close towards the end when he looked at the couple and said: "We need to get y'all married."

Asked whether the address was planned or off-the-cuff, the Archbishop of Canterbury interjected, saying: "Let's have an honest answer."

"It was planned and I thought it was going to be six minutes," Mr Curry said.

"It was a little longer than that because there were pauses in there," he added to laughter from Archbishop Welby.

Mr Welby, who officiated the wedding, said the exchange of vows had the "most extraordinary" sense of intimacy, despite millions around the world viewing it.

"It did feel when doing the vows that it was just the three of us despite the fact there was all these millions and tens of millions of people elsewhere," he said.

"It was very close, very personal, very intimate and very beautiful.

"It was a really mesmerising experience."