Considered by many to be the greatest Irish song poet of her generation, M ire Bhu N Laeire (Yellow Mary O'Leary; 1774-1848) was an illiterate woman unconnected to elite literary and philosophical circles who powerfully engaged the politics of her own society through song. As an oral arts practitioner, M ire Bhu composed songs whose ecstatic, radical vision stirred her community to revolt and helped to shape nineteenth-century Irish anti-colonial thought. This provocative and richly theorized study explores the re-creative, liminal aspect of song, treating it as a performative social process that cuts to the very root of identity and thought formation, thus re-imagining the history of ideas in society.