2. "I've noticed this with hip-hop artists" In response to In response to 0
I think part of it has to do with a lot of these artists get interviewed by rap mags that don't have a substantial online imprint. And it's not like there are electronic archives of old issues of the Source, Rap Pages, XXL, or even Vibe. So most of these interviews that have background on these artists or albums get lost to time.