Pulsar Halloween

In the early 70's the young French Prog scenario was full of competent bands that were being listened in and outside their country, and while most of them ascribed to the "French Theatric Symphonic", early Pulsar decided to re-create the sound of Pink Floyd with that unique Gaulish sound with a lineup of competent musicians formed by Jacques Roman (organ, piano, synth), Victor Bosch (drums, percussion), Gilbert Gandil (guitar, vocals) and Philippe Roman (bass), but something was missing so they recruited the flutist and string musician Roland Richard.
Their 1975 debut "Pollen", was acclaimed by most critics (despite the economic failure in the UK), who saw them as a breeze of fresh air, because they didn't limit themselves to copy a style, but added some Symphonic touches that gave them a special flavor…

Essential: a masterpiece of progressive rock music
I remembered the first Le ORME album I ever bought. It was "Ad Gloriam", an odd pick given that album isn't what you call progressive (it was psychedelic pop).