This may not be what you're looking for, but the inherent drawback with threads like this is not knowing the tastes of the person making the request as well as the depths to which they are already familiar. For example "lost gem" and "Tai Phong" are not two items I personally put side-by-side, so we might have a different interpretation on things.
One suggestion I have is to go to a website like Gnosis, go to "view top rated albums", pick a year, and start scrolling down until you find some highly rated artists you're unfamiliar with and check out some samples. I've discovered a lot of great music this way over the years.
If you're specifically looking for something like Novalis, you could do range of years in the 70s from Germany.
http://gnosis2000.net/cgi-bin/gnosearch.cgi
I did a quick search - 1975, at least 15 rates. Some of the items that popped out to me:
Harmonium - Les Cinque Saisons
Atoll - L'Araignee Mal
Modry Efekt - Modry Efekt & Radim Hladik
Apoteosi - s/t
Finnforest - s/t
I highly recommend all of these.
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