In the early years Boston was essentially Tom Scholz who played pretty much all of the instruments on their demo tape of course with Brad on vocals (RIP). Then they had to go out and hire a band to actually tour with!
How about something from Alan Parsons Project? Though not difficult to replicate the sound outside of a studio, there was always this rumor of them being a "studio only" band, with a zero chance of seeing them live. Of course that wasn't true, but it is still some kind of urban legend that I always associate with them.