There are several ways to subscribe and/or be notified when ‘new’ shows are released.

iTunes – The shows are not listed in Apple Podcasts. It’s necessary, therefore, to manually add the feed address to your iTunes application. Copy this address into the Subscribe to Podcast box in the app:
https://musicnostalgia.com/feed/podcast
(Note that Feed Address can be used to subscribe manually in any podcast application.)

Android – Add the above feed address to your podcast application.

Email – Add your email address to the Subscribe To Site Updates in the right hand panel of any page. You will receive an email whenever shows are added, and only then. (And I don’t share your address with any other entity!)