There's a nice story to that song, Wetton recorded it with Heep in the studio and then Byron - the actual lead singer - came in and Wetton was concerned he'd throw a fit, the mood was edgy in the band by then and Byron's days numbered. Instead, Byron listened intently and then said: "That's real good, I think I'll play some keyboards to it." And so he did, that is Byron playing the keyboards on that studio track. He never asked to sing it. It was even the first track on High and Mighty, the last Heep album with Byron.
Byron and Wetton got along well at a time when the other Heep members had begun to hate Byron for his antics. I always wondered whether the fact that both were alcoholics - kindred spirits in the truest sense of the word - had to do with that. They both left at the same time - enter John Lawton (after David Coverdale, Gary Holton and Ian Hunter - a wild mix of singing styles for sure - all declined) and Trevor Bolder.
Unlike about his time with Wishbone Ash, Wetton never spoke badly of his tenure with Heep. Or as Hensley once quipped: "It bought him a house and sure enough he left us after he had paid it off."
No hard feelings though, decades later he would play it with Ken Hensley live - though not on bass ... (yet he pretty much doubles on guitar what the bassist does).