Let's double down on the theme of "first song, first album" as Yes wasn't the only artist to venture out with a first in 1969.
Take 3 major vocalists of prior groups Buffalo Springfield, The Hollies, and The Byrds and put them together in this folk/pop/psychedelic rock supergroup, and we've just struck gold. Only one Canadian short of an "up the antee" lineup, this would do (for now).
To put into words what this collaboration was and what it meant going forward, I can think of no one other than David Crosby to sum it up as he did on the first album liner notes:
This was one of those times where everything clicked. I don't want to sound cosmic or anything, but it's almost like there was a greater force at work, and I don't just mean Ahmet Ertegun. The degree to which this all fell together was so astoundingly high you almost feel someone -- or something -- wanted to happen. Granted, all three of us were talented guys, but we also knew our combination was somehow blessed. The three of us have different voices. We have different accents. We have different attitudes. We are very different people. But the thing that happens when you put those three voices together is just amazing. As soon as we started singing together, we knew we were into some brand-new, wonderful terra incognita. There was some magic there, and you can hear that magic all over our first album.
"Suite: Judy Blue Eyes" - Crosby, Stills, & Nash