SquareSpace is comparable to Wix and WordPress more than a dedicated ecommerce platform like BigCommerce. However, it offers many features that are attractive for smaller websites. If your ecommerce business is on the smaller side and you’re not looking for advanced features, SquareSpace will make setting up an online store pretty simple and painless.
In the end, WooCommerce gives you more SEO-specific options overall, purely because of the fact that it's built on top of WordPress. The only problem is that your site speed largely depends on the hosting you go with. Because of this, the SEO category goes to Shopify. You don't have to worry about optimization much, and your speeds are always going to be top-notch.
We regret to inform you that due to a funding shortage, the FMA will be closing down later this month. The future of the archive is uncertain, but we have done everything we can to ensure that our files will not disappear from the web forever. The full audio collection will be backed up and available at https://archive.org/details/freemusicarchive (some of the collection is already there; feel free to go browse).

Before the advent of copyright law in the early 18th century and its subsequent application to music compositions first, all music was "free" according to the definitions used in free software or free music, since there were no copyright restrictions. In practice however, music reproduction was generally restricted to live performances and the legalities of playing other people's music was unclear in most jurisdictions. Copyright laws changed this gradually so much so that in the late 20th century, copying a few words of a musical composition or a few seconds of a sound recording, the two forms of music copyright, could be considered criminal infringement.[3]
BigCommerce is most easily compared to Shopify. Both platforms offer a similar experience when building an ecommerce platform. Like Shopify, BigCommerce offers a range of prices and packages tailored to different types of businesses. The platform is highly customizable if you are comfortable with some light coding. It is also possible to use themes and templates to build your website, but some of these will come at an additional cost.