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".
After he Moody Blues released "Seventh Sojourn" late in 1972, they took a hiatus during which each of them released at least one solo LP, and Hayward and Lodge collaborated on "Blue Jays". By this time the mellotron had been put out to pasture permanently with the departure of keyboard player and 'tron expert Mike Pinder; as a fan of their late'60s - early '70s style I regard this as mostly unfortunate, but most of the solo LPs contained some superbly orchestrated material like this song, which really is glorious! All manner of strings, horns, and flute (not by Ray Thomas, I don't think) combine to make this one of the best-arranged songs in rock history. Moodies veteran producer Tony Clarke did the honours here, although he didn't last beyond 1978's "Octave", which coincidentally (or not?) was their last really good LP!