I've found more new music in the last 5 years, than in the previous 15-20. For me, it's Radio Paradise (main mix) and Spotify Discover Weekly. Also, there are 3-4 very active music threads here on AudiogoN that have been very valuable in that respect.
Do you have Spotify? Maybe I can make my "Discovered" playlist public so you can leverage it. It has grown to 283 tracks, 20 hours of music. Most tracks are new discoveries, but there are a few rediscovered treasures.