John O'Callaghan is an Irish DJ and producer. He is known for being a founding member of the trance hardstyle group Subculture, as well as for his solo productions and remixes. O'Callaghan has also been involved in several side projects, such as Mannix, which was a duo with former Subculture member Bryan Kearney, and was disbanded in 2013. He has also collaborated with trance artist Vast Vision under the name "O'Callaghan & Kearney".

John O Callaghan Present Mannix - Dream On Extract :