"Belfast has certainly changed since my youth, for the better, I'm very happy to say.
"I just remember certain parts of the province that we were playing in, there were always two of us that didn't speak on any show," he said.
"It was like, 'OK, you two shut up tonight, don't say anything.'
"So there was that tension but yet when we played together on stage, we never thought about any of that stuff."
Campbell said he believed the music also served as an escape for concert goers.
"It is something that unites people and in this day and age it's become more important because the world is quite fractured to say the least," he said.
"We need more love, we need more music and more pizza.'


