“No, it’s not the Led Zeppelin song. It’s the Free song of the same name. I just love the riff. And that Simon Kirke drumbeat gets me every time. Glenn Hughes does a vocal cameo, and he’s simply unreal.

“This was the last song we did in Greece before we packed up and came back to the States. Because we were getting ready to leave, a lot of my gear was already gone. All I had was left with me were my Marshall Super Bass head and a cabinet - total old school. But it was exactly the kind of setup Paul Kossoff [Free’s late lead guitarist] might’ve used.

“I used a Les Paul on it. I didn’t do anything tricky. On a cut like this, you use your guitar’s volume control on 4, and maybe you turn it up to 6 for lead. That’s it. Very simple but very effective. I’d be lying if I said I wasn’t channeling Paul Kossoff in some way. Whenever I pick up a Les Paul, I think about him.”