I just stumbled upon a great site which gives links to archived music wav files. This has to be illegal and may not last, but it sure is nice to hear such recordings.

I was looking for sound samples of Sousa marches and searched on Google for Sousa, radio, archive....and found this site with a tremendous variety of links to full wav recordings. I checked out 5 sites and only one had buffering which interrupted my listening.

Here it is:

http://wgnradio.com/shows/ex720/music2.htm