Links

For finding music sources and dates:

Early American Secular Music and Its European Sources, 1589 -1839: An Index
http://www.colonialdancing.org

Tunes at Ceolas - The Fiddler’s Companion
http://www.ceolas.org/tunes/index.html#index

Irish Traditional Tune List
http://www.drajdoyle.co.uk/irttl.html

For finding text and music:

Bodleian Library - 30,000 broadsides - English 16th -20th centuries
http://wwwbodley.ox.ac.uk/ballads/

National Library of Scotland - Broadsides - 18th century and more
http://www.nls.uk.broadsides/

Folk Music of England, Scotland, Ireland, Wales and America - Leslie Nelson Burns - Sound bytes, texts and history
http://www.contemplator.com/folk.html