Top 10 Underrated Prog Bands (their progressive albums/years) 1. Black Sabbath UK (1970-1, 1973-'78) 2. King Diamond Denmark (most albums) 3. Manfred Mann's Earthband UK (1973-'78) 4. Sieges Even Germany (most albums) 5. Garden Wall Italy (all albums) 6. Taylor's Universe Denmark (all albums) 7. Argent UK (1974-'76) 8. Mercyful Fate Denmark (1983, 1993) 9. Led Zeppelin UK (1973-'79) 10. Azazello Russia (all albums)