I just discovered my new favorite internet music site. www.progarchives.com
I have only just dusted off my old vinyl albums from 20 years of storage, but haven't gone out and bought a turntable to re-listen to them yet so... www.progarchives.com is allowing me to re-experience the delights of Kaleidoscope (the UK band), Procol Harum, Dead Can Dance, Jade Warrior, and find some new (OK...old) music to enjoy.
The site also has links to some online radio stations that specialise in Prog Rock - what could be better to test by than prog rock? The 10 minute French masterpiece "Depuis L'Automne" by Harmonium?
I've just heard Gryphon for the first time. Ah, splendid, they don't make music like that anymore.