Na Rósaí performs traditional Irish, Appalachian, Scottish, and Breton tunes and songs on fiddle, flute, uilleann pipes, bouzouki, and whistles. Their focus has been exploring the links between the musical traditions of the British Isles and North America by arranging tunes from the two regions with a traditional sensibility. Na Rósaí is Irish Gaelic for "The Roses" in honor of Portland, the City of Roses.
In 2010 Erik Killops returned to Portland, Oregon after studying Irish Fiddle at the University of Limerick in Ireland. Shortly after his homecoming he met recent New Hampshire transplant and bouzouki player Richie Rosencrans and California native and piper Preston Howard at sessions around town. After realizing common musical interests they began a weekly performance at a local watering hole. In the autumn of 2012 flute player Conor Ó Bryan moved to Portland from Chico, California and immediately joined the ranks of the group.
The band released their first self titled album in 2014.