The Hi-Los Spotlite recordings are probably the most audacious vocal writing in the history of Popular Music, in spite of plenty of moments of androgynous piffle and/or camp that knows no shame. It doesn't matter, that stuff is off the hook, all the way. Their very first recording (not on Spotlite, btw, but today sometimes bundled in with those recordings), "They Didn't Believe Me" is just so....radical. "Outside the box" hell, these guys were outside the box, off the shelf, through the door, into the car, and on the plane, all in less than three minutes. (curbing impulse to rag on the wimpy Four Freshmen right now...)
Singers Unlimited, I didn't dig back in the day, I might now, but maybe not. I don't dig Columbia Hi-Los as much as Spotlite Hi-Los. Maybe Puerling "got it all out" early on and realized that if he kept on doing it like that, he'd have to repeat himself, and eventually become a gimmick writer, so he decided on a more moderate approach that would surprise less but wear easier over the long haul. I don't know.
What I do know is that the guy was a master of his craft, a knowing practitioner of his art, and that ain't nobody before, after, and quite possibly ever come close to what he did early on.
RIP, and thanks. Big thanks.