www.bluegrasscollege.org is a free site that teaches bluegrass tunes! Click link below:
Fiddle Hangout Here's a link to Fiddle Hangout, where you can hear a LOT of great tunes, many played by one of my favorite fiddlers, Gary Lee Moore https://www.fiddlehangout.com
A link to a free download of Jay Ungar playing Margaret's Waltz (audio only). Copy and paste this link: https://jayungarandmollymason.bandcamp.com/track/margarets-waltz
A link to sheet music to Jay Ungar's version of Margaret's Waltz (scroll to bottom of page): http://jayandmolly.com/fiddler-magazine/