For lovers of 20's 30's music, I can make some strong reccomendations for finding CD recordings that are wonderfully remastered; recent advances in technology and software have been a boon to those of us who love early 20th C. jazz/popular music.
ANYTHING on the Jazz Oracle label out of Ontario. Their releases aren't cheap, but the sound quality is excellent, much of it the work of legendary 78 rpm record remastering genius R.T. Davies. Jeff Healey is a founding member of the label, and has been an avid collector of vintage jazz records from his early 'teens.
Timeless Records, from Holland http://www.streamxs.com/
The Red Hot Jazz Archive: The DEFINITIVE info source on early jazz, and wonderful samples.
The Hot Jazz & Dance Pages: Glen Richards' site offers a wonderful photo archive, and a link to a tribute page to Thelma Terry, virtuoso jazz bassist. FREE DOWNLOADS!!
http://www.2multiples.com/hotdance/
Radio Dismuke: my favorite 20s/30s internet radio program. Superb. http://www.dismuke.org/radio/