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As for what could have been, I don't know. Which song off the first album could have been a big hit?
Spinning the debut rn, and it seems to me that "Come In The Morning" & "Changes" would have been good picks for an up-tempo single, and "Someday" & "Sitting By The Window" might have broken through if programmers would have taken a shot on a slow/melancholy track. "Omaha" was a bit too out there for AM radio (so of course it charted highest).
Putting out five singles out at once was perhaps the dumbest of the dumb moves Columbia pulled re:the first album.