Fred Blassie, King of Men
A concept album if there ever was one!
Oh, and Tommy and Quadrophenia from the greatest rock band of them all, The Who
Although "Who's Next" isn't actually considered a 'concept album', it did begin its life as a 'concept' ... Pete Townshends "Lifehouse" project ... which was supposed to incorporate a multi-media experience with immediate and direct feedback and 'participation' of the 'viewer' or 'listener' or however Townshend envisioned this 'concept'. (nobody really understood it, and Pete had a difficult time explaining it)
Years later Pete said that something akin to what the Internet is today is what he envisioned way back then with "Lifehouse" .... so perhaps it wasn't Algore who started it all .... hehehehehee :)