Sean O'Riada (1931–1971) was a seminal Irish composer and musician, widely regarded as a pivotal figure in the revival of traditional Irish music. He primarily worked in the genres of traditional Irish folk music and classical music, blending both to create a unique sound that resonated with audiences. O'Riada's notable works include the creation of the musical ensemble Ceoltóirí Chualann, which played a crucial role in popularizing traditional Irish music in the mid-20th century. His composition "Mise Éire," a score for the documentary film of the same name, is particularly significant, as it combined orchestral elements with traditional Irish melodies and themes, introducing a wider audience to the richness of Irish culture. His impact on music is profound; O'Riada is often credited with bridging the gap between traditional Irish music and contemporary performance, inspiring future generations of musicians. His innovative arrangements and emphasis on the importance of Irish heritage have left a lasting legacy, influencing not only traditional musicians but also the broader folk music scene in Ireland and beyond. O'Riada's work laid the foundation for the cultural revival that characterized Ireland in the latter half of the 20th century.