Poul Anderson, Isaac Asimov, Ambrose Bierce, Algernon Blackwood, Robert Bloch, Ray Bradbury, Fredric Brown, John Brunner, Arthur C. Clarke, L. Sprague de Camp, Guy de Maupassant, Arthur Conan Doyle, H. Rider Haggard, Robert Heinlein, Shirley Jackson, M. R. James, Fritz Leiber, Murray Leinster, H. P. Lovecraft, Archibald MacLeish, H. Beam Piper, Edgar Allan Poe, Frederik Pohl, Robert Sheckley, Robert Silverberg, Curt Siodmak, Carl Stephenson, Robert Louis Stevenson, Theodore Sturgeon, Dalton Trumbo, H. Russell Wakefield, Stanley Weinbaum, H. G. Wells, Jack Vance, Jules Verne, Kurt Vonnegut & Roger Zelazny

2000 Plus
Arch Oboler's Plays
The Black Mass
CBS Radio Mystery Theater: 1 2 3 4
Columbia Workshop
Dark Fantasy
The Devil and Mr. O
Dimension X
Escape
  1947-1948
  1949-1950
  1951-1952
  1953
  1954
Favorite Story
The Hall of Fantasy
The Hermit's Cave
Inner Sanctum Mysteries: 1 2
  1941-1943
  1944
  1945
  1946
  1947
  1948
  1949: A B
  1950-1952
Lights Out: 1 2 3 4 5
MindWebs
Murder at Midnight
The Mysterious Traveler
Mystery in the Air
The Price of Fear
Quiet Please
The Shadow
NBC Short Story
Space Patrol
The Strange Dr. Weird
Suspense
Theater Five
The Weird Circle
The Witch's Tale
X Minus One

For many reasons, from imperfect source recordings to careless mp3 encoding, the audio quality of classic era radio plays available on the internet varies considerably. Fortunately, different versions of an episode are likely to exist, so a decent listenable one can usually be found.

RTSF strives to post links only to recordings with good audio quality. Occasional exceptions may be made if, for example, a hard to find episode features a particularly good story or performance, but not if it would mean having to endure a painful listening experience.

Note that music and loud and lengthy sound effects take the hardest hit. This is often the case regardless of the apparent overall sound quality of an episode. Expect this and be pleasantly surprised when, from time to time, the music and sfx do sound good.

The Frequency of Fear
Escape and Suspense!
QuietPlease.org
Internet Archive: Radio Program List
Internet Archive: OTR
OTR.Network Library
The OTR Plot Spot
Frank Passage's OTR Program Logs
OTRR
Mark Time Awards
Mark Time SF Audio Hall of Fame
Sound Affects on KFAI
The 7th Dimension on BBC7
Space Casey
Cosmic Hobo Productions
SFFaudio
Audio Drama Talk
Spider on the Web

Each OTRR collection contains the most complete and accurate version of the series with the best possible sound quality.

Dimension X complete series download (singles)
The Devil and Mr. O complete series download (singles)
Dark Fantasy complete series download (singles)
Theater Five complete series download (singles)
The Planet Man complete series download (singles)

A Shipment of Mute Fate
Alley Cat
Ancient Sorceries
The Black Cat
Cat's Cradle
Little Old Lady
The Lucky Lady
Nobody Loves Me
Queen of the Cats

Orson Welles on Suspense features The Hitchhiker by Lucille Fletcher, The Most Dangerous Game by Richard Connell, The Lost Special by Arthur Conan Doyle, Philomel Cottage by Agatha Christie, Lazarus Walks by Robert Richards, The Marvelous Barastro by Ben Hecht, The Dark Tower by Alexander Woollcott and George S. Kaufman, Donovan's Brain by Curt Siodmak and the Donovan's Brain parody (Orson Welles Radio Almanac). Music directed by Bernard Herrmann. Full zip and singles.

Earthsearch II (9 of 10)
Earthsearch II (8 of 10)
Earthsearch II (7 of 10)
Earthsearch II (6 of 10)
Project Raphael (1 of 3)
Gobble Gobble (Fear on Four)
Journey Into Space: Operation Luna
  (2 of 13)

What secret ingredient does audio theater possess that makes it so seductive...? The answer...lies not in a special ingredient, but in the lack of one. Audio is blind. Audio is the most intensely visual of media precisely because of its sightlessness.

- Yuri Rasovsky, The Well-Tempered Audio Dramatist

I still think radio is probably the greatest entertainment medium ever invented. It made the audience work, and I think television audiences don't have to work—that's why they fall asleep half of the time.

...what makes radio really exciting is the all-round creativity of it. The writer creates the original, then the director creates the ambiance for the actors, and the brilliant technicians who manipulate the tapes, dials, sounds and music create the atmosphere. But the most creative of all participants in the joys of radio are the listeners, the audience....The listener is set designer, costume designer, make-up man, and even the casting department. They 'see' the characters they hear, then put them into the drama quite literally, in make-up, into the set, the wardrobe, even the mood and atmosphere.

- Vincent Price, 1970 interview

Science fiction is perhaps the most important audio theatre genre in the 21st century and if one includes the related genres of horror and fantasy, these works of creative imagination, technical prowess and infinite possibilities are the most entertaining artists in this field have to offer.

- David "Mark Time" Ossman, Firesign Theatre