My list of good Renaissance songs:
Mr. Pine, Face of Yesterday (these two are really by a different band)
Prologue
Can You Understand*, Let It Grow, Carpet Of The Sun (the last two are my personal favorites), Ashes Are Burning*
Black Flame*, Mother Russia*
Trip To The Fair*
Can You Hear Me?*
Northern lights

* indicates more progressive songs, but they are really hampered by the instrumental passages.