Brien Boru pipes (plurale tantum)
Erroneous spelling, only encountered in American internet sources; NB (plurale tantum): The term is also used when referring to 1 instrument only.
McCandless, Brian: Bagpipe names – A very long list. In: Jl. North American Assoc. of Lowland and Border Pipers 6 (Elkton (MD), 1993), p.48 (»Marcuse [Brian boru]).