I remember hustling up money & saving my lunch money back in the early to mid 90's just so I could buy a tape then CD. That's how serious I was about this muisc. Not just Bay but all rap music. There was so much dope shit out back then it was rediculous. I stayed in the record store. I was hella known in school for having all of the dopest shit. I always had all of the new shit as soon as it dropped. Everybody was coming to me to dub them a tape back then. I was also known for having all of the dope unknown shit too. Rappers that weren't popular but were hella tight.
Shit, I never had enough cash to get all the shit I wanted, but I always copped Bay Area shit. Just kuz when ever I got a compiliation, it was always sick and diverse. I just remember going to the record store and at one point THERE WAS JUST TOO MUCH SHIT COMING OUT.
Most of the time, the whole album was good. Some albums I got, maybe 1 or 2 songs.
Props to an old skool bay music kat! Yeah, those were they days.
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As for quality music... I think its trends, consistancy in radio or buzz, and colabs.
Trends - I mean like Crunk or hyphy.. which is in its region not a trend, but everywhere else it is. People either feel it or keep its distance. But basically party/club music. Think Soulja boy.
Consistancy - well, people wonder why Lil Wayne cracked a million or gets alot of radio play... well because he's constantly doing something and keeping his name and songs on radio. Not to the point that you see like 5 songs at once, but enough to keep interest in him.
I guess both the above is also plays a role in public interest.
I say colabs because is someone has appeal in other regions, if that person kinda "exposes" or reintroduces someone else, that dude's stock might go up or generate more or new interest in that person.
You can be underground or unsigned and make hot music. But its connecting with the mainstream, different regions, taking your rap game up by doing something more...
"Gotta Spread yo Hustle if you down to pop, from the east to the west coast it aint gonna stop" - Spread yo Hustle