Best Sounding LPs

You mentioned folk and country . Jazz and classical seemed to be pretty well covered here so I will list some great folk, bluegrass, rock recordings. All of which can be found new.
In folk:
Greg Browns "Poet Game"
Doc Watsons "Southbound"
Alison Krause and Union Station
Joan Baez's "Angeline", "Diamonds and Rust"
The Weavers "Live at Carnegie Hall, 1963"
Harry Belefonte "Live at Carnegie Hall"
In Blues:
Muddy Waters "Folk Singer"
The Anne Arbor Folk and Blues Festival
Doug McLeod "Hard to Find" (this one you will have to get used)
Rock:
Pink Floyd "Dark Side of the Moon"
Any of the Led Zepplin reissues
All the Bob Dylan reissues
All the Peter Gabrial reissues
Beach Boys "Pet Sounds"

George Waters "Amused to Death" (nothing to compare with, #1)
Purim,Moreira "Dafos"
Pink Floyd "Final Cut" Japan
Dire Straits "Love over Gold" and "Brothers in Arms"
and a look to:
http://www.tnt-audio.com/topics/fav_e.html

Many thanks to all who replied. My shopping list is long!

Man-oh-man, don't know how I missed this thread. My mouth is watering...
About all I can add to the fabulous responses above:

Any jazz on Japanese label Three Blind Mice
Another Canadian Holly Cole LP - Romantically Hopeless, this one includes a bonus 12" 45rpm w/amazing cover of Paul Simon's "One Trick Pony"
Louis Armstrong - Satchmo Plays King Oliver reissue (45rpm or 200g CLassic Records)
Best cheap domestic folk/rock beachy,happy hour music: Jack Johnson - Brushfire Fairytales
Cheers, Spencer

The Speakers Corner reissues of the Decca and Mercury classical catalogs is not to be missed by classical music listeners. And all are currently available. In another forum I offered my thoughts as to the best of the Speakers Corner Decca reissues. Since Sbank reactivated this thread, I thought I should come back and add those thoughts here for any who might have an interest.

First, BUY ALL OF THE SPEAKERS CORNER MERCURY CLASSICAL REISSUES.

Then, for the Speakers Corner Decca reissue series, you can literally scroll through Speakers Corner's website picking out the music you like and order that. You simply will not go wrong. But asked to chose those that I consider at the very "top of the pile" both musically and sonically, I would chose the following:

Mendelssohn, Sym 3 (Scottish), Maag/LSO, Decca SXL 2246-45rpm
...(one of the great Decca recordings - Wilkinson at his best)
...(an absolute "must buy")
Chabrier, Espana, Argenta/LSO, Decca SXL 2020
...(a beautiful Kingsway Hall recording by Gordon Parry)
Debussy, Images pour orchestra, Argenta/OrchSuisseRom, London CS 6013
Debussy, Prelude a l'apresmidi d'un faune, Monteux/LSO, Decca SXL 2312
...(a Kenneth Wilkinson, Kingsway Hall recording)
de Falla, El Amor Brujo, de Burgos/NPO, Decca SXL 6287
...(a Kenneth Wilkinson, Kingsway Hall recording)
Grieg, Piano Concerto, Boult/LSO, Curzon -pf, Decca SXL 2173
...(a Kenneth Wilkinson, Kingsway Hall recording)
Kodaly, Hary Janos Suite/Galanta Dances, Kertesz/LSO, Decca SXL 6136
...(a Kenneth Wilkinson, Kingsway Hall recording)
Prokofiev, Sym 6, Weller/LPO, Decca SXL 6777
...(a Kenneth Wilkinson, Kingsway Hall recording)
Rossini, Overtures, Gamba/LSO, Decca SXL 2266
Schubert, Sym 9, Krips/LSO, Decca SXL 2045
...(a Kenneth Wilkinson, Kingsway Hall recording)
Shostakovich, Str Qt 8, Borodin Qt, Decca SXL 6036
Stravinsky: Le Sacre Du Printemps, Solti/CSO, Decca SXL 6691
...(Kenneth Wilkinson, Medinah Temple, Chicago)
Varese, Ionisation/Integrales/Arcana, Mehta/LAPO, Decca SXL 6550

http://www.speakerscorner.de/Speakerscorner/newsite/E/index1.htm

Good luck