As part of my website (QS' sister site, Sierra Music Central, www.sierramusiccentral.com) being updated over the back half of 2020, I started a Sierra music group on Facebook for Sierra music discussion. There's already a few posts with facts and unreleased music. Anyone is welcome to join, assuming you don't join to share memes or the same old posts from every other Sierra-related group!
https://www.facebook.com/groups/290216345394928