It seems incredibly hard to "discover" an artist these days. There are so many musicians out there that aren't quite good enough. To be able to pick out the good ones pretty much requires dedicating your life to it: http://www.npr.org/people/2100252/bob-boilen
Its much easier just putting together a dream team of writers and musicians that have made hits in the past.
That being said there is still an amazing amount of great music out there that doesn't hit the charts. Live music seems to be the best place to discover and contribute to those artists. Too bad its mostly focused in a few major cities.