External resources that have proven themselves worthy during the years:

• The BNR Metal Pages (1995-)
  One of the oldest sites dedicated to heavy metal, and still going strong.

• No Life 'til Metal (2000-)
  Possibly the largest personal review archive of metal albums from various genres.

• Voices From The Darkside (2000-)
  This stylish webzine is notable for some great interviews of old thrash metal bands.

• Classic Albums (2001-)
  Awesome collection of most rare out-of-print metal albums in RealAudio format.

• Dark Lyrics (2001-)
  The largest metal lyrics archive on the web, with no unnecessary fluff or quirks.

• Metaleros (2001-)
  Excellent information about metal from Latin America, with a lot of unique details.

• Encyclopaedia Metallum: The Metal Archives (2002-)
  The ultimate heavy metal database today. Their discussion forum is very active, too.

• The Corroseum (2003-)
  Great info on many obscure metal albums and related topics, like old record labels.

• The Thrash Metal Guide (2007-)
  The name says it all - a massive collection of data can be found here to dig into.

• Metal Forces Magazine (2011-)
  The famous metal magazine from the 1980s now online. Their archive contains original reviews of many classic albums and demos.