King Crimson releases a landmark debutOct 10, 1969Labels: King Crimson, In the, Progressive rockKing Crimson
Pink Floyd expands rock into orchestral formsOct 2, 1970Labels: Pink Floyd, Atom Heart, Orchestral rockPink Floyd
ELP’s debut brings virtuoso prog mainstreamNov 20, 1970Labels: Emerson Lake, ELP debut, Virtuoso rockELP album
Genesis solidifies a new lineup on Nursery CrymeNov 12, 1971Labels: Genesis, Nursery Cryme, Phil CollinsNursery Cryme
Yes releases Fragile and broadens prog’s audienceNov 12, 1971Labels: Yes, Fragile, Rick WakemanFragile
Jethro Tull issues Thick as a BrickMar 3, 1972Labels: Jethro Tull, Thick as, Concept albumThick Brick
Genesis releases Foxtrot featuring “Supper’s Ready”Sep 15, 1972Labels: Genesis, Foxtrot, Supper's ReadyFoxtrot
Virgin launches with Mike Oldfield’s Tubular BellsMay 25, 1973Labels: Mike Oldfield, Tubular Bells, Virgin RecordsTubular Bells
Yes stretches the double-album concept with TalesDec 7, 1973Labels: Yes, Tales from, Double albumTales
ELP releases Brain Salad Surgery on its own labelDec 7, 1973Labels: ELP, Brain Salad, Band labelBrain Salad
King Crimson’s Red signals a heavier prog directionOct 1, 1974Labels: King Crimson, Red, Heavy progRed album
Genesis releases The Lamb Lies Down on BroadwayNov 22, 1974Labels: Genesis, The Lamb, Rock operaThe Lamb