I have all of the Dubliners old LPs and Luke Kelly`s early singing voice was much better than his later recordings, just listen to Luke singing Tramps and Hawkers one of his best renditions and Raglan Road, all on early discs, sublime.
I have been to numerous Dubliners shows and Luke although he carried on gamely despite his illness,was definitley not at his best in later recordings. Ard Mhacha.