This list was compiled through a year's worth of research and tabulation done diligently by Lou Cornelius & Grace Mareus and overseen by host/producer Tom Gagliardi. The parameters for this annual tabulation is as follows:

• We do not include compilation albums and/or greatest hits sets
• We do not include box sets or archive releases.
• We do not include studio albums from prior to the last year.

What did qualify this year were the following:

• Studio releases from December of 2020 to the end of 2021.
• Live albums released within December 2020 to the end of 2021.
• Tribute releases.
• By audience request, this year we also included EP releases.

We also must give a big thanks to our loyal online listeners & subscribers at Aural Moon, House Of Prog Radio, and RCBC Radio. Also a special thank you to those who contributed music when the artist and/or label did or would not, along with our subscribers to our Facebook, Twitch, Youtube, Instagram, and Twitter outlets. Another thanks has to go to all of those supporter donations, our colleagues & analysts who fall under the banner of the GPRN who were agenda-free and supported a fair & diverse list of music and suggestions that made 2021 another excellent year of music. And we cannot forget the excellent online resources & publications that assist as well such as http://gnosis2000.net http://progarchives.com http://expose.org our staff at North13th Studios, Lost Satellite Productions, Asylum Studios, Rick & Mary Pat Henry, Jim Brennan, Lou Cornelius, Grace Mareus, Jason Varga, Grace Lotierzo, Michael Cohn, Sean Mickel, Gale Gervasio, Chad Hutchinson, the group at esurveyspro, Jack Webster, and our Top 100 consigliare, Ken Golden.  

And of course the biggest thanks who had the patience of Saint, in the lovely and amazing Loren Rojas Ospina.

Finalized by Tom Gagliardi and Jack Webster.