Since the late 1990s, melodic death metal bands have added more melodic choruses and riffs and have used keyboards more prominently than other death metal bands; their lyrics, unlike those of death metal, did not focus on death, violence, gore, horror, or blood for the most part. Its influence lead to the diversification of modern metalcore, with melodic metalcore gaining prominence in the 2000s, especially in the United States. Stewart Mason of Allmusic stated that the "increasingly melodic" style of Swedish death metal combines the post-hardcore aggression and guttural vocals of black metal with melodic and technically proficient guitar lines. Stewart Mason claims that the style has become very popular in the United States, using the term "Swedecore" to describe Scandinavian-style metal as played by non-Nordic bands. The American melodic death metal band The Black Dahlia Murder, formed in 2001, is an example of this, gaining considerable prominence with 5 albums charting on the Billboard 200.
^Metal Hammer February 2008: "Lyrically we were different too...People were surprised that we were a death metal band that wasn't singing about blood, gore and horror movies" It was during this time (___) broke onto the scene, transforming the style.