Here's probably Gryphon's best album: https://www.youtube.com/playlist?list=OLAK5uy_lgbwOrp3BUZ077ACpefFplxO0aWbZ2qEE

And here's a selection of tracks by Circulus: https://www.youtube.com/watch?v=VUQuDfmDqP8 https://www.youtube.com/watch?v=DpE4XK9hJWs https://www.youtube.com/watch?v=uM12Rd0udXI https://www.youtube.com/watch?v=ciWOXQJAhQg