A great prog country that is overlooked even by progarchives is Japan. Here are my favorite Japanese prog bands and what they sound like:
Malice Mizer: Symphonic Prog. They mix rock with baroque classical music. Currently not making any more music. FAVORITE SONG: SYUNIKISS
Moi dix Mois: Symphonic Prog. Formed by the former guitarist of Malice Mizer, so they sound exactly the same. FAVORITE SONG: N/A
Gackt: Art Rock. Former lead singer of Malice Mizer. It's a combo of pop and art rock. Most prog albums are Moon, Mars, and Crescent, in that order. Rebirth is not very progressive oriented. He has an extremely wide vocal range. Think Freddy Mercury. FAVORITE SONG: LUNA
X Japan: Prog Metal. Probably not prog, but they sound prog-esque. They sound like a combo of Dream Theater and Scorpions. The first really successful Japanese band. FAVORITE SONG: SILENT JEALOUSY or KURENAI
L'Arc~en~Ciel: Art Rock. They sound kind of like Rush in the 90s, but more interesting because their songs are all different. Lead singer has a wide vocal range. He sounds a bit annoying when he sings high, but his middle and lower octaves are incredible. Their older music has more of an 80s feel (think Journey), but their newer stuff has better vocals because the lead singer sings deeper now. FAVORITE SONG: READY STEADY GO
Dir en Grey: Experimental. For fans of weird music. Their songs range from death metal screaming to dark prog melodies similar to Tool and Pink Floyd melded together. Their lead singer is not too good, but he writes all the lyrics, which mostly tell some kind of dark story. FAVORITE SONG: CAGE
Siam Shade: Art Rock. My favorite Japanese band. They sound like Rush's Moving Pictures or Permanent Waves melded with Van Halen. Their lead singer doesn't have a very wide range, but his tone is good. He reminds me a bit of Geddy Lee from the 80s. FAVORITE SONG: DREAMS
The Black Mages: Instrumental Prog Metal. They sound like Yes on steroids. They are composed of a bassist, a drummer, two guitarists, a keyboarder, and a hammond organist. The hammond player, Nobuo Uematsu, writes all the music, and he also composes film and game scores (like Trevor Rabin). FAVORITE SONG: FORCE YOUR WAY