Here's an excerpt from O'Neill's 1001 and East Clare: A Curious Connection, by Gerard Foley:

In 1903 Captain Francis O'Neill published O'Neill's Music of Ireland. This was a collection comprising 1850 Airs, Jigs, Reels, Hornpipes etc. It met with success and, arising from this, he perceived a popular appetite for a compilation specifically dedicated to the dance music of Ireland. Many of the tunes in the new collection would be drawn from his previous effort but in 1906 he travelled to Ireland in search of further material for this project. He found little music to excite him until he heard a handful of tunes near Feakle in East Clare. In 1907 he published The Dance Music of Ireland, O'Neill's 1001. This book, over time, became an important printed source of new tunes for traditional musicians all over Ireland. The conundrum is that several tunes now identified as part of the East Clare repertoire are drawn almost directly from this collection.

I followed Google leads to two copies of The Dance Music of Ireland, O'Neill's 1001 in Google Books, but neither was available for viewing. But persistence paid - click here.

Both O'Neill's books have been reprinted by various publishers and are available for a very reasonable price (under $25 a copy) - but they don't have banjo tab (do they have banjo tab for fiddle session tunes?). I know that Mel Bay publishes at least one of the books and Walton's the other.

-Joe-