Old time fiddling is featured on a regular basis. Recent interviews include people like J. P. Fraley and Ralph Blizzard. They also have some great videos available for sale. This is a magazine I can highly recommend. The Fiddler's Companion is a huge encyclopedia of fiddle tunes from the Celtic, British and American traditions.
Most tunes contain references to published or recorded versions.
This database contains somewhere in the order of 50,000 entries. A different style of music is featured each week. Other classes available include fiddle repair, bow construction, all types of singing and dancing, arts, crafts, etc. This one is operated by Jay Unger and Molly Mason. Jay wrote Ashokan Farewell and many other most excellent tunes.