Tony Pastor was a schister who copyrighted other people's songs.
'Lannigan's Ball', like 'Rocky Road to Dublin' was written by D K Gavin of Galway and popularised all over Britain by Harry Clifton. Pastor in America nicked many of Harry Clifton's songs and the sheets are there on the Levy website. I would guess that Clifton put the music to it but he often used earlier tunes. 'Work, Boys, Work and be Contented' was set to 'Tramp, Tramp, Tramp, or The prisoner's Hope Song' by, yes you've guessed it, Work!