Brian Johnson has paid tribute to his former AC/DC bandmate Malcolm Young, who died over the weekend at age 64.

The band’s former singer penned some words on his website about the rhythm guitarist underneath a photo of Young and a headline that states, “For 32 years we stood side by side on stage.”

Johnson left the band in April 2016 after being advised by doctors to stop touring due to hearing loss that could have been exacerbated onstage. Young was diagnosed with dementia earlier in the decade, and performed his last show with AC/DC in 2010. At the time of the announcement of Young’s illness in 2014, Johnson called the guitarist and band co-founder its “spiritual leader.” MORE