If you don't do your own histories, then who is to say if they are any good? It's much easier to find crap about old songs than good information. Even authorities screw things up, so you have to checkeverything.

The tune "Shein Sheis Shus Lum" is in 'Sources of Irish Traditional Music', I, #208, 1998. The is the earliest tune for any known Gaelic song that has a known tune. According to SITM the tune (and song) were sung by John Abell in his Stationer's Hall concert, and they reprinted it from Abell's 'A Collection of Songs in Several Languages', 1701. The song first appeared in 'The Merry Musician', 1716, the year of Abell's Stationer's Hall concert. Neither song (in any language) nor tune is in Abell's book of 1701 [Copy in Library of Congress.]

All the histories of the Irish and other songs in the Scarce Songs 1 and 2 files on my website are my research. Others have given more extensive histories of some songs there, but mine, I know, are as nearly as possible correct as far as they go.