Here We Go Again.

As you might guess, the two were deeply involved with the soundtrack forMamma Mia!

For diehard ABBA fans, the two maestros also have a bit of onscreen fun in the film.

“Mamma Mia! Here We Go Again” - World Premiere - Red Carpet Arrivals

Karwai Tang/WireImage

DirectorOl Parkersays the experiences of filming those two cameos were vastly different because of the time involved.

“Bjorn was baffled by how long it all took and how boring it was,” he recalls.

“He was great,” Parker says.

“He loved it.

That seemed a little smug.

But it just seemed the right place for him, and he was very funny.”

“He’s obviously a complete genius and a phenomenal songwriter.

Cinematographer Robert D. Yeoman says Andersson had as much, if not more fun in between takes.

“We were getting ready to shoot and he was sitting at the piano,” Yeoman recalls.

Everyone gathered around the piano and they all started singing.

Everyone is laughing and having a great time.

It was one of the things that happens on the film set that makes it all worth it.”

Yeoman says that was one of his favorite moments from a set that was bustling with warmth and energy.

“Benny was spoofing the Brits a little bit,” he says.

“It was fun, and it was all done in a warm spirit.