According to Williams, he wanted to take part in the recording sessions for"Power Up"as a tribute to Angus's late brother, founding AC/DC rhythm guitarist Malcolm Young, who died in 2017 from effects of dementia at age 64.Malcolm is credited as a writer on all 12 tracks on"Power Up".
Last year,Williams revealed that a "terrible" bout with vertigo contributed to his 2016 retirement. He also admitted the return of both Johnson
and Rudd convinced him to rejoin the group. "It was like the old band back together," he told
Rolling Stone. "It was not like starting over again, but as close to the band that's been together for 40-plus years as we can possibly make it. I didn't want to miss that."