"Duo," released on August 5, 2015, is a captivating album by the renowned Mark O'Connor, featuring a stunning collaboration with his daughter, Maggie O'Connor. This 43-minute journey through bluegrass and newgrass genres is a testament to the O'Connors' extraordinary skill and musical prowess. The album, released under OMAC Records, showcases a diverse range of tracks, from traditional tunes like "St. Louis Blues" and "Swing Low, Sweet Chariot" to original compositions such as "Jerusalem Ridge" and "Appalachia Waltz." Each track is a masterclass in violin and guitar interplay, demonstrating the O'Connors' ability to blend classical technique with folk and country influences. The album's standout tracks, like the lively "F.C.'s Jig" and the evocative "Ashokan Farewell," highlight the duo's dynamic range and musical chemistry. "Duo" is not just an album; it's a celebration of musical heritage and innovation, making it a standout release in the world of contemporary folk and bluegrass music.