The OP requested "Paddy's Lamentation":-

Paddy's Lamentation - Mary Black (YouTube)

That and all other revival versions (Silly Wizzard,etc) are derived from Edith Fowke's recording of O.J.Abbott's "By the Hush, me Boys". He learned the song in early life on Ontario farms. The following link has short clips of all tracks from the album "Irish and British Songs from the Ottawa Valley", O.J. Abbott FW04051. Scroll down for "By the Hush".

Smithsonian Folkways - By the Hush, Me Boys - O.J. Abbott

The other request later in the thread appears to refer to "An Unconstant Lover" by Maura O'Connell:-

Unconstant Lover - Maura O'Connell (YouTube)

Ross