The big-name boss formed management firm Q Prime with Cliff Bernstein in 1982 and looks after the affairs of Metallica, Jimmy Page, the Red Hot Chili Peppers, Muse and many others.

But he can't forget a particular moment during his first role as representative in his twenties. Speaking on a Reddit Ask Me Anything session Mensch says: "The dumbest request I've ever received was while managing AC/DC. I was in London. They were in Paris. Phil Rudd wanted hot water because his kettle was broken. He called at midnight to ask me to bring over hot water�

"Wish I had told him I would charter a flight to bring him a kettle, and billed it back. Needless to say, I didn't go."