Grunge is a genre that originated from Seattle as a subgenre of alternative rock, punk rock, and heavy metal. The reason why it’s associated with heavy metal is only due to the distorted guitar element in its music. Famous pioneers of grunge music were Nirvana, Stone Temple Pilots, Alice in Chance and some other less famous bands that originated from Seattle. There is no precise way to determine what type of music a band is playing, but there are few hints of what you can expect to hear from their music in terms of confining musical expression in genres. For every genre that originated from the alternative rock, you can mention hard rock, experimental rock or even pop rock as key elements that define their music. If you’ve been to any of their concerts, you would agree that defining their music cannot be done with few words.