Anyone can upload just about anything to the internet, and they do, in their droves. It's not in the slightest just big names, that's quite ridiculous.

Even a basic search turns up several websites dedicated to the shetlands dialect and its songs, including a one that sells cds, reams of archives , dictionaries, a forum were you could ask about it, and the tools you would need to share any information you do gather to make it easier for the next person. Think you're really underselling and/or underutilizing the options available to you.