Metal spilling into punk music

Over the course of rock music history metal has influenced punk and vice versa. For instance, it was metal and hard rock music that first began to use minor keys heavily and dissonant scales. Soon punk took up the minor keys and the dissonant sounds via hardcore punk and crust punk. Many crust punk bands are labeled thrash also, because of similar chord progressions.

Back when Soundgarden came out they mixed black sabbath riffs with the asethetics of punk. By the time they had come out metal had moved on past the black sabbath sound (except doom metal, sludge metal, and stoner metal) and had become faster and more technical. The music itself had changed along with the sound of punk. Punk was taking ideas from other music combining it with the Do it yourself attitude.

A recent development in punk taking influence from metal music is this year's Warped Tour. As mentioned in http://www.guitarworld.com/warped-tour-best-metal-tour-year, there are now so-called metal bands on the Warped Tour. However, if you talk to a die-hard metalhead they would say all of those bands on the Warped Tour aren't real metal and that they are emo, or something else.

This article shows another example of punk taking ideas from metal. Most of these bands on the warped tour that are being referred to as metal are really metal core, or hardcore that is influenced by metal. This style tends to be less technical and have more emphasis on the feeling. By the time these bands had come out, metal had changed again, becoming more technical and more demanding. Just take a listen to Revocation or Abysmal Dawn. They are two modern day metal bands who are very technical. In addition, the breakdowns which are common with these metalcore bands tend to be frowned on by a lot of metalheads. However, the metalcore bands are considered metal because they are heavy and aggressive.

One of the quoted from the article relates to what was mentioned above. For example, "August Burns Red was more direct, but just as impressive. Like an old school thrash band, ABR has the ability to deliver a memorable choruses without diminishing the power of their music." August Burns Red suposedly sounds like an old school thrash band. However, the thrash sound can also be punkish, as evidenced by crust bands who are considered thrash also.

So even though the Warped Tour bands might be heavy they might not neccessarily be metal, they are more likely metal-influenced.