https://www.mne.psu.edu/lamancusa/tunes.html

https://www.slippery-hill.com/search-page

100's of tunes that can be played on the fiddle.   There is also tab for the auto harp.

This web site has 1,000's of bluegrass tunes with lyrics. 

Fiddle Tunes

this site has a fiddle instruction for the tune Cattle in the Cane

the history of the waltz and fiddling