Found via Google search and not yet tried. Descriptive copy (edited) is per websites listed.~S~
WoodSongs Old-Time Radio Hour, broadcast live weekly from Lexington KY with a theater audience. You can watch the 300k webcast (or listen on 56k), Mondays beginning at 6:30 p.m. EST.
Twelve Bar Club (London) Live shows webcast in video every night at approx 20:30GMT (3:30EST Microsoft MediaViewer software required.
Worldwide Music Network: A webcast and streaming media search engine with listings for live audio/video broadcasts and archived streaming media clips.
The Fat Cat. There are someimes live webcasts from The Fat Cat, from CFOG.
Music Videos using Shockwave Video and Shockwave Streaming Audio.