The Internet Archive http://archive.org is building a digital library of Internet sites and other cultural artifacts in digital form. It is a huge resource of OTR (Old Time Radio) & other materials. You'll find Westerns, Mysteries, & Lux Radio Theatre recordings to name a few. All able to be downloaded or listened to from the site. It's worth listening top & viewing
owner, Chronicles of Crime, your mystery bookshop, Victoria, BC, Canada
Thanks so much to F. Thorsen for this valuable information!
The link doesn't work but if you put www.archive.org in google, you should find it.