My focus has been primarily rock/pop in most if it's iterations. A tendacy I've always had a has been being attracted to band names, album titles and cover art whether I've heard of it/them or not. Sometimes I've been pleased and sometimes not.
I wish I had the time and resources alluded to by dedicated "diggers" but do not. I am however scouring for used recordings far more than before and am now taking into consideration producer, other personell involved and what recording studio or where it was located. Oddly, or maybe not, is thst I am making used purchases that I totally passed over for a variety of reasons when they were new.
That statistic of a small portion of artists being responsible for a huge portion of available product was something I have believed for a very long time. The past few years, I Google search my new acquisitions and am usually enlightened and frequently perplexed why some of them (artists or recordings) were not popular or at least better known.
That Jamaican born pianist who recorded in Montreal was as good an example as any but there are many others and for multiple reasons. Like the host of the Ted Talks segment, I am firmly of the opinion that the majority of talent out there is largely unknown and that opinion applies to authors too.