The following is a list of sites that I follow, commonly use, check often, and highly recommend for research/content/news/etc.
Music Listening Sites
http://www.apple.com/music/
http://www.spotify.com/us/
http://www.youtube.com/
http://www.soundcloud.com/
http://www.amazon.com/
http://www.vevo.com/
Dynamic Music Sites
http://www.rollingstone.com/
http://www.spin.com/
http://www.nme.com/
http://www.artistdirect.com/
http://www.pitchfork.com/
http://www.billboard.com
http://www.allmusic.com/
http://www.reverbnation.com/
Mainstream Music News Sites
http://www.sputnikmusic.com
https://www.ultimate-guitar.com/news/upcoming_releases/
http://www.gigwise.com
http://kroq.cbslocal.com/
http://www.91x.com/music-type/new-music/
Hard Rock/Metal Music News Sites
http://www.revolvermag.com/
http://www.loudwire.com/
http://www.blabbermouth.net/
Indie/Alternative/Rock Music News Sites
http://www.stereogum.com/
http://www.alternativeaddiction.com
http://www.indierockcafe.com/
Punk Music News Sites
http://www.absolutepunk.net/
http://www.punknews.org/
Ranking Sites
http://www.metacritic.com
http://www.rankopedia.com/
http://the-top-tens.com/
Lyric Sites
http://www.letssingit.com/
http://www.lyricspremiere.com/
Music Research Sites
http://www.wikipedia.org/
Music Blogs
http://www.intlmusicsnobs.com/
http://www.unbiasedwriter.com
http://www.somekindofawesome.com/