Reddit, a social website where members post headline links, has a subreddit dedicated to DJs and Musicians, "for those in the music industry, as well as those that are interested in music composition, production and theory. Enthusiasts welcome! Also, consider discussing audio hardware and software! Questions are encouraged regardless of how basic/advanced! We are also interested in discussing the facets of the music industry, including record labels."
It has a lot of enthusiastic members and a ton of info. I've posted a grab of some of the topics below.
If you are a pro or an aspiring musician, you should check it out HERE