They are, though, the people who produced the music about which the nebulous thing we now call Goth crystallised. The term 'Goth' was one applied to these bands by the music press, but it was more applied to their fans. Goth came from the fans of musicians, not from the bands themselves. Many of these bands produced music in styles outside of what is considered Goth, some of them starting as punk bands that evolved through Post-Punk into producing things in the style that became the 'Goth' style, some of them taking their music in directions outside of that style later in their careers.
Siouxsie Sioux is a musician whose career illustrates both of these aspects of these changes in musical direction. She started out as Sex Pistols fan who decided to have a go with a few friends, and whose first public performance involved her reciting the Lord's Prayer over an improvised instrumental, and her musical career evolved through punk beginnings to Siouxsie and The Banshees' Post-Punk work a was actually quite experimental and influenced by quite a variety of things (David Quantick called 'Peek-a-Boo' an "oriental marching band hip hop with farting horns and catchy accordion" in his review in the NME, published 23 July 1988, and that I think illustrates this eclecticism.).
After the Banshees were reduced to Siouxsie and Budgie being 'The Creatures' their music took another turn in direction, partly because Budgie being a drummer and Siouxsie being a singer meant that outside of the studio their music was quite pared down to percussion and vocals, and this had its practical limitations, but partly because their creativity drove them to try new things - "Manchild" for example, is a story in song set in Ancient Meso-America about human sacrifice - a dark theme - but musically its inspirations clearly come from various periods and places.
Siouxsie's distinctive sense of fashion, the often dark subject matter of the music she performed, the timing of her work coinciding with the nascent Goth subculture, and her links to Post-Punk made her an early Goth icon, despite the fact that stylistically she and the Banshees were highly varied and not always within the stylistic bounds of what is now described as Goth.;This is partly because in the early 1980s Goth was a lot less concrete.Siouxsi and The Banshees were not the only band to have a stylistically varied career and yet somehow become part of the (oft debated) 'canon' of Goth music. The Cure, for example, went decidedly pop for a while, before returning to darker rock, although their later work was certainly not as Goth as their earlier work such as 'A Forest'.
It takes a substantial body of work for a genre to become established, and it takes innovators being followed by the people they inspire, and that takes time. The later imitators are probably actually more Goth because they tended to stick quite closely to their inspirations, and therefore had an output that was more stylistically consistent and within the bounds of what is now termed 'Goth', though this does not mean they were necessarily as good because in being derivative some were not necessarily fulfilling their potential and may have done better allowing themselves more creative scope rather than trying to stay within a style.
Quite a few of the first wave bands - most notably The Sisters of Mercy (though they were late in that wave) - reject the Goth label, and I actually support this. Goth is not a term to label the bands themselves, more a description of individual pieces of music that they produced. The people themselves do not identify with the subculture. Some find the label to be constrictive, with both commercial concerns and creative concerns about such a label possibly resulting in aiming music at a target audience and therefore loosing some creative freedom. Some simply do not fit that label consistently enough to think it applies to them.
The original Goths are not the members of these bands - they are the fans who took inspiration in terms of fashion and music from these people and expanded it into something much bigger, pulling in influences from sources as diverse as centuries-old architecture, Victorian literature, early 20thC horror movies and futuristic science-fiction costumery. While we can thank people like Siouxsie Sioux, Dave Vanian, Patricia Morrison and Robert Smith for inspiring us, we should thank ourselves for the community we have built, for the vast amount of expansion and creativity that has come after that initial musical spark, and for basically building the subculture. Goth exists because of Goths, especially promoters, designers, organisers, musicians, artists and crafters.
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(I had an interesting debate in the comments of one of my posts about whether the Cure were Goth once - I LIKE these debates - feel free to debate this or any other post with me in the comments. I find reasoned arguments for and against my position, positive reactions where people expand on what they like and most of all constructive criticism to be the most helpful and interesting comments! It is actually reading and responding to the comments that is the most enjoyable part of blogging. I'm in this subculture and have ties to others for the love of their various facets and discussing them is fun!)