The Guns 'N Roses guitarist had misgivings about his bandmate stepping in to sing with the 'Back in Black' rockers after Brian Johnson was forced to quit performing on doctors' orders in 2016, but was pleasantly surprised when he went to see them in action.
Slash told the Los Angeles Times newspaper: ''The Axl-doing-AC/DC thing, I went and checked that out, and it was awesome. I was probably as sceptical as anybody because of the iconic status of the band.hing his bandmate perform with the group, though.
''He pulled it off and it was great.''
The 'Welcome to the Jungle' hitmaker was drafted in for the latter part of AC/DC's 'Rock or Bust World Tour' in 2016 after Brian pulled out due to hearing issues.
The 'Highway to Hell' stars went through a transformation last year with bassist Cliff Williams retiring, guitarist Angus Young's brother Malcolm Young - who quit the group in 2014 - passing away, and Brian pulling out of the tour due to his hearing problems.
However, not everyone is keen on the idea of another legendary band member replacing Brian.
Def Leppard's Joe Elliott recently said he wouldn't have replaced the 70-year-old frontman with Axl if he was in AC/DC, because he wouldn't have ''dealt with'' the situation in that way if he had been part of the group.
He said: ''I wouldn't have done it like that.
''I can't speak for [AC/DC guitarist] Angus [Young] and his team as to what their reasons were for doing what they did.
''But considering that we had a drummer [Rick Allen] lose an arm and we waited for him. The way that they dealt with it was not the way I would have done it, put it that way.''
While he didn't agree with the way Axl took Brian's place in the band, Joe, 58, thought the 'November Rain' singer did a ''pretty good job'', but to him the current line-up doesn't feel like the AC/DC of old.
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As it's almost Valentine's Day, you'll be looking for that perfect romantic playlist to set a dinner date to, right?