Boston was pretty much a put together band
Correct. Glen Campbell, formerly of The Beach Boys (and The Wrecking Crew), sang the lead on that song.
My point was: The Little Dippers produced one song - that was it - and it was literally off-the-cuff at the end of the day. There were no other singles, much less an entire album.
Sagittarius was a dedicated studio effort by Gary Usher (Beach Boys) and Curt Boettcher (The Association), and they produced an entire album.
I own it. I like it. I like Baroque Pop; Pet Sounds, the precursor, is my favorite album.