Melodic hardcore is a broadly defined subgenre of hardcore punk with a strong emphasis on melody in its guitar work. It generally incorporates fast rhythms, melodic and sometimes distorted guitar riffs, and vocal styles tending towards shouting and screaming. Nevertheless, the genre has been very diverse, with different bands showcasing very different styles. Of the pioneering melodic hardcore bands such as Bad Religion and Descendents, some have proven influential across the spectrum of punk rock, as well as rock music more generally.