Sometimes, people mostly famous in other genres of music have demonstrated their prog chops. F.ex since we're talking Dave Stewart and related, on National Health's prog-fusiony debut, Neil Murray plays bass. He's best known for playing in Whitesnake and Black Sabbath! I don't think Dave Stewart from Eurythmics was ever a progger, though.
If Annie Lennox was in a band with the Canterbury-Dave Stewart, she might have to dance along to something like this :
One of Dave's catchier compositions from NH. Intro before the song gets going lasts until about 2:10 .. Ahh, what magnificent music.