You could start your 20 with all Hendix's LPs.
If I'm living after death then the music will be with me - being killed is unlikely to make me forget it.
Suspect Gandhi waould be more likely to paraphrase Gladstone than vice versa.
I like to think that Gandhi would have liked Hendrix's music & encouraged him to overcome the booze & chemicals.
Two icons taken before their time.

Zombies O & O
Smoke s/t Sidewalk
El Prunes Underground
Los Mac´s Kaleidoscope Men
Sonics Here are
Remains s/t
British North American Act s/t
Kinks Village Green...
John Cale Paris 1919
Velvet U s/t(3rd)
Nick Drake Fives leaves left
Jackson C Frank s/t
Beatles Revolver
Shoes Present Tense
Big Star Radio City
Del Shannon Charles Westover
F Mac Bare trees
S & G Bookends
Donovan Sunshine Superman
Flamin´ Groovies Shake some action

I´m basically a 45 kinda guy BUT that would be impossible to list only 20.

Seeds - S/T
Golden Dawn - Power Plant
13th Floor Elevators - Psychedelic sounds of
13th Floor Elevators - Easter Everywhere
Chocolate Watch Band - No Way Out
Chocolate Watch Band - Inner Mystique
Flat Earth Society - Waleeco
Beatles - White album
Jefferson Airplane - Surrealistic Pillow
Byrds - Preflyte
Captain Beefheart - Safe as Milk
Love - S/T (1st)
West Coast Pop Art Experimental Band - A Child's Guide to Good & Evil
Action - Brain
Wailers - Out of our Tree
Fapardokly - S/T
Boots - Here are the Boots
Count Five - Psychotic Reaction

Just realised I have a frighteningly large number of the LPs in peoples lists, well over 1/2 of them.
Incidently, what tracks are on what Brits call BeeGees 1st?

Stuart & Mark:
THE MONKEES-THE BIRDS THE BEES AND THE MONKEES
-PISCES , AQUARIUS

That took guts. But youse both correct. those ARE fine lps.

Philsers: HEAD would be a contender if it were not for that most horrid Davey Jones "Daddy's Song" (Nilsson???) wot ruins the whole lp.

still waiting fer your list wally olde pal..hope you are well

Wallace expects you all would not be interested in Wallace's top 20. As expected there is a disproportionate amount of pwog there:

Bo Hansson - Lord of the Rings
Mike Oldfield - Ommadawn
Il Roveshio della Medaglia - contamiazione
Genesis - Nursery Cryme,Selling England by Pound,Foxtrot
Procol Harum - same , Shine On Brightly
Pink Floyd - relics
Jethro Tull - Passion Play

etc

There was a proportion of prog on mine too. In fact I was thinking of a VDGG album as well but there are favourite tracks on Wave, Pawn and H to He so too hard to choose.
Liking your Procol Harum, Genesis and Pink Floyd choices, although Relics is a comp.

VDGG would HAVE to be "Pawn Hearts"
Triumverat - Illusions on a Double Dimple
Eloy - Silent Cries Mighty Echoes
Gentle Giant - In a Glass House, Three Friends
Uriah Heep - Salisbury
Flock - Dinasour Swamps
ELP - Pictures at an Exhibition
Moody Blues - To our children's,children's children
(My best re-discovery of the last year was Lodge & Hayward's "Bluebirds". Somehow back in the day I didn't think too much of it, but I guess Ive mellowed. Remarkable lp, but on a best of 20 - well, maybe not)


Some non-progs on my list:
Simon & Garfunkel - Bookends
Kinks- Village Preservation Society
Pretty Things - SF Sorrow ( in the top three for sure)

Not familiar with these:

Ernie Graham
FZ & The MOI - We're Only In It For The Money
Capdevielle
Bim Sherman
Gigalo Aunts

I see you have Gentle Giant on there Wallace,i only heard Gentle Giant for the first time a few weeks ago,i didnt really know what to expect but i took the plunge and bought their self titled album on cd,i must admit to really liking it,some nice stuff on there,so thats been my discovery of the month.As for Procol Harum,both albums you mention are excellent.I see youre another one who has SF Sorrow by The Pretty Things on your list,this seems to be the most popular album out of all the lists,so i take it on this forum SF Sorrow beats Pink Floyds "Piper at the gates of dawn"as peoples most popular listen?I was surprised how few gave Pink Floyd a mention on their lists!!Interesting!!

The curious thing about Gentle Giant is that the Brits themselves didn't think much of them. They made it bigtime in Canada & Italy.
Funny how things like that happen.
The Canadian band Mashmakan really hit it with the Japanese audience, who knows why.

Stuart- I guess you know SIMON DUPREE & THE BIG SOUND? This is pre-Gentle Giant and popsike, not prog.

Frank Zappa & The Mothers Of Invention - We're Only In It For The Money
Starring such classics as Whats The Ugliest Part Of Your Body, Hot Poop & Bow Tie Daddy
Got some experimental stuff on it too. It was a band album rather than just self indulgent Zappa.

Yup, SF Sorrow almost unanimous throughout.
I think a few of their other LPs are not too far behind either ( in my book )
Zombies seem to be in second place.
There are a lot of artists not too well represented, for myself, Beach Boys, Love,
Hendrix, Buffalo Springfield, Floyd and many others...it's not that I don't love
them but it's hard to pick a particular LP

Mr Whoppo,
totally with you on Fools Gold,didn't get it either.
No jangle, no harmonies.
Strangely it's probably their best known song in the UK, always on the radio.
I much prefer the exquisite guitar goings on on the flip.
Mostly festivals here too and the ones that weren't sold out in less than a half hour...I tried!