Tell me about it. I always do this to myself, but I make at least some progress at the very least.
So I'll post my findings below for prog albums up to 1970. A couple things to keep in mind,
-As everyone has a controversial choice in what to include and not include in prog, I'm going to state right out that I don't consider Captain Beefheart nor Frank Zappa to be prog. They're avant garde, and while worth talking about, not in my scope of what prog is.
5-12-67 Procol Harum “A Whiter Shade
of Pale/Lime Street Blues”
9-67 Procol Harum “Procol Harum”
11-10-67 The Moody Blues “Days of
Future Passed”
67 CzesŁaw Niemen “Dziwny jest ten
świat”
1-22-68 Spirit “Spirit”
Spring-68 Sampler “You Can All Join
In”
4-68 Eric Burdon and the Animals “The
Twain Shall Meet”
7-19-68 Family “Music in a Doll's
House”
7-26-68 The Moody Blues “In Search of
the Lost Chord”
9-68 Procol Harum “Shine on Brightly”
10-68 Caravan “Caravan”
10-68 Aphrodite's Child “End of the
World”
10-68 David Axelrod “Song of
Innocence - The Mental Traveller"
11-68 The Nice “Ars Longa Vita
Brevis”'
11-68 Pearls Before Swine “Balaklava”
12-68 The Soft Machine “The Soft
Machine”
68 Pärson Sound “Pärson Sound”
68 Grupa 220 “Nasi Dani”
68 Mort Garson “The Wozard of Iz: An
Electronic Odyssey”
68 Sampler “Rock Machine I Love You”
2-69 Spirit “The Family That Plays
Together”
3-69
Family “Family Entertainment”
Early-69 Touch “Touch”
4-25-69 The Moody Blues “On the
Threshold of a Dream”
6-69
White Noise “An Electric Storm”
8-69 Procol Harum “Salty Dog”
8-69 Can “Monster Movie”
9-69 The Soft Machine “Volume Two”
9-69
Nice “The Nice”
9-69 Jethro Tull “Stand Up”
10-69 Pentangle “Basket of Light”
10-10-69 “In the Court of the Crimson
King”
11-69
Kevin Ayers “Joy of a Toy”
11-21-69 The Moody Blues “To Our
Children's Children's Children”
69 East of Eden “Mercator Projected”
69 High Tide “Sea Shanties”
69
Clouds “Make No Bones About It / Heritage”
69
Clouds “The Clouds Scrapbook”
69
Amon
Düül II “Phallus Dei”
69
Renaissance “Renaissance”
69
The Advancement “The Advancement”
69
Xhol Caravan “Altena”
69
Xhol Caravan “Electrip”
69
Sampler “Wowie Zowie! The World of Progressive Music”
69
Collegium Musicum “Zvoňte zvonky”
69
The Orient Express “The Orient Express”
69
Taste of Blues “Schizofrenia”
69
Mighty Baby “Mighty Baby”
69
Trikolon “Cluster”
69
Krokodil “Krokodil”
69
Friendsound “Joyride”
69
Don Robertson “Dawn”
69
Jody Grind “One Step On”
69
Audience “Audience”
69
Writing on the Wall “Power of the Picts”
69
Valhalla “Valhalla”
69
Clark Hutchinson “A=mh2”
69
Rare Bird “Rare Bird”
1-19-70 Czesław Niemen “Enigmatic”
2-70 Waterloo “First Battle”
2-70 Van der Graaf Generator “The
least we can do is wave to each other”
3-13-70 Egg “Egg”
3-70
Gong “Magick Brother”
3-70
The Greatest Show on Earth “Horizons”
5-70
Audience” Friend's Friend's Friend”
5-70
Quartermass “Quartermass”
5-15-70
King Crimson “In the Wake of Poseidon”
6-5-70
Procol Harum “Home”
6-6-70
Soft Machine “Third”
6-13-70
Uriah Heep “...Very 'Eavy ...Very 'Umble”
6-70
The Nice “Five Bridges Suite”
6-70
Julian's Treatment “A Time Before This”
Mid-Late
70 Delivery “Fools Meeting”
Mid-Late
70 High Tide “High Tide”
7-14-70 Supertramp “Supertramp”
7-70 Tully “Tully”
7-70 Traffic “John Barleycorn Must
Die”
8-7-70 The Moody Blues “A Question of
Balance”
8-70 T2 “It'll All Work Out in
Boomland”
9-4-70
Caravan “If
I Could Do It All Over Again, I'd Do It All Over You”
9-70 Can “Soundtracks”
9-70 Atomic Rooster “Death Walks
Behind You”
9-70 Andrew Lloyd Webber and Tim Rice
“Jesus Christ Superstar”
10-23-70 Genesis “Trespass”
10-70 Kevin Ayers “Shooting at the
Moon”
11-20-70 ELP “Emerson, Lake and
Palmer”
11-27-70 Gentle Giant “Gentle Giant”
11-70 Warhorse “Warhorse”
11-70 Steamhammer “Mountains”
12-4-70 Wishbone Ash “Wishbone Ash –
Pheonix”
12-11-70 King Crimson “Lizard”
12-70 Van der Graaf Generator “H to
He, Who Am the Only One”
Late 70 Lucifer's Friend “Lucifer's
Friend”
70 Judas Jump “Scorch”
70 Aardvark “Aardvark”
70 Abstract Truth “Totum”
70 Abstract Truth “Silver Trees”
70 Accolade “Accolade”
70 Ache “De Homine Urbano”
70 Affinity “Affinity”
70 Amon
Düül II “Yeti”
70 Annexus Quam “Osmose”
70 Aquila “Aquila”
70 Arbete Och Fritid “Arbete Och
Fritid”
70 Black Window “Sacrifice”
70 Bo Hansson “Sagan om Ringen”
70 Bruce Haack “The Electric Lucifer”
70 Collegium Musicum “Collegium
Musicum”
70 Cressida “Cressida”
70 Culpeper's Orchard “Culpeper's
Orchard”
70 Dom “Edge of Time”
70 East of Eden “Snafu”
70 Ekseption “Beggar Julius Time
Trip”
70 Ekseption “3”
70 Focus “In and Out of Focus”
70 Frumpy “All Will Be Changed”
70 Gracious “Gracious!”
70 Guru Guru “UFO”
70 Gypsy “Gypsy”
70 Igor Wakhevitch “Logos”
70 Ihre Kindler “2375 004
(Jeans-Cover)”
70 Ihre Kindler “Leere Hände”
70 Life “Life”
70 Lost Nation “Paradise Lost”
70 Magma “Magma”
70 Marek Grechuta “Marek Grechuta &
Anawa”
70 Marsupilami “Marsupilami”
70 May Blitz “May Blitz”
70 Mickey Curtis and Samurai “Samurai”
70 Nosferatu “Nosferatu”
70 Orange Peel “Orange Peel”
70 Oriental Sunshine “Dedicated to
the Bird We Love”
70 Os Mundi “Latin Mass”
70 Quarteto 1111 “Quarteto 1111”
70 Rare Bird “As Your Mind Flies By”
70 Raw Material “Raw Material”
70 Room “Pre-Flight”
70 Rutus Zuphall “Weiß der Teufel”
70 Sampler “Bumpers”, “Fill Your
Head With Rock”, “Picnic – A Breath of Fresh Air”,
“Rockbuster”, “The Age of Atlantic”, “Vertigo Annual”
70 Sharkmove “Ghede Chokra's”
70 Sperm “Shh!”
70 Supersister “Present From Nancy”
70 Syrinx “Syrinx”
70 Taman Shud “Goolutionities and the
Real People”
70
The Greatest Show on Earth “The Going's Easy”
70 The Underground Set “The
Underground Set”
70 Titus Groan “Titus Groan & …
Plus”
70 Xhol Caravan “Hau-RUK”