This must be the epitome of French progressive rock, a (mostly) languid song made by piano and organ on top of the usual rock instrumentation. There is a short fast/noisy bit just before the middle that jars a bit, but basically you want to just lie back and relax while listening to this track, it's so mellow and lovely. Also recommended: "St. John's Avenue" and "The Gulf Of Knowledge" from their second LP "Windows".
Grobschnitt were a German progressive rock band that specialized in a rather frothy style with plenty of lead guitar work that is light rather than heavy. This track kicks off what is probably their best-known LP "Rockpommel's Land", and it's the prettiest eleven minutes you've ever heard! Ostensibly it tells the story of a boy named Ernie and a bird called Maraboo that's carrying some beer bottles, was smoking a pipe and was lit contrary to regulations. The whole LP is excellent!
from Rockpommel's Land (Brain), available on CD (Brain)
Most so-called "progressive rock" was really progressive pop, but not this track, which does rock out and which has a great big guitar hook (you'll know it when you hear it), which resolves several different ways within the song, i.e. the band were creative. It kicks off the last of their big three LPs ("Jumbo" and "Rockpommel's Land" were the first two), and according to the liner notes was a concert favourite.
A 10 minute progressive rock epic, that builds from an atmospheric beginning before climaxing in a flurry of death metal brilliance and winding back down again.