Widely hailed as the greatest R&B act in music history, Boyz II Men are still going strong after 23 years - with a string of chart-topping hits, multi-platinum albums and countless awards under their belts.

It was their eponymous single End of the Road which catapulted them into global stardom: It stayed at number one for a record-breaking 13 weeks in 1992, stealing the crown from Elvis Presley - whose record Don't Be Cruel/Hound Dog remained at the top for 11 weeks.

Now down to three members, Shawn Stockman, Nathan Morris and Wanya Morris, they spend much of their time in residency at The Mirage Hotel in Las Vegas honing their craft and serenading their female fans with their iconic, heart-melting harmonies and synchronised dance routines.

As they prepare for their seven date UK tour next month on the back of their latest album Collide, they say they are excited to play the O2 ABC in Glasgow after performing at the 2011 MOBO Awards and a show Edinburgh in 2012.

"We love Scotland. It's beautiful - like something out of a storybook," Shawn said.

He added: "The Scottish people show so much love - and they're great fun. They're just really in touch with hiphop and R&B, as much as people across the pond in the States. We're so looking forward to coming back."

Now in their early forties, the trio now have their own families and projects on the side of the band - juggling record labels, TV appearances and charity work in their spare time whilst taking time out with their children.

After Shawn's son Micah was diagnosed with autism as a toddler, he and his wife Sharhonda set up a non-profit organisation called Micah's Voice in 2012 to support families that struggle to pay for their child's healthcare.

"We recently had our first benefit for the Foundation, and even though it was pretty small it was really successful," he said.

It seems that on the road, Boyz II Men's partying days while on tour are over.

"You hear a lot about this 'rock 'n' roll' lifestyle that bands have while they're on tour. It might have been like that in the past, but we've grown older and our priorities have changed," Shawn admitted, adding: "After the show, we like to meet people then just go back to the hotel."

Despite their changing priorities, Shawn, Nathan and Wanya are still unwaveringly committed to Boyz II Men as they were when they first started out - with a new doo-wop concept album in the works which documents the changing eras of soul music whilst paying homage to artists that have inspired their music - with guest vocals from singer Amber Riley and Jimmy Merchant from Frankie Lymon and the Teenagers.

"We have a very similar taste in music, but we can appreciate different genres," Shawn said.

"One artist we would all love to work with is Prince, but I would love to work with Nas, or maybe on a rock record with Kings of Leon and Black Keys.​"

That Boyz II Men have an eclectic, ever-changing musical influence is perhaps a testament to over two decades in such a fast-paced industry, still making music in their own imitable style in a landscape of fleeting success, autotune and electronic beats.

But they are determined to keep things as fresh when they perform to crowds now as they did when they started out in the early Nineties - singing like they are still trying to win their fans over for the first time.

"Because we sing a lot of slow love ballads, people always expect that sort of vibe at our concerts - but we like to bring real hip-hop energy onstage.

"We're blessed enough to have fans that know the songs, that sing along and make the show. The fans made us who we are today."

So what is Boyz II Men's secret to a long-term career in music?

"Patience, love and consistency," Shawn said, continuing: "You've got to realise that you're not always going to be popular or mainstream.

"We've been together 23 years, and everything feels as good as it was - the only difference is that we're not plastered across MTV anymore.

He added: "You've got to have the courage not to care what people think, work hard and enjoy it."

Boyz II Men play the O2 ABC in Glasgow on Tuesday, May 5.