Sebastian has a worldwide, long term publishing agreement with Universal Music Publishing. He has written songs for other artists, including co-writing "Dot Com", a song performed by Usher on "Rhythm City Volume One: Caught Up". He also has an interest in production and co-produced "The Memphis Album" with Steve Cropper. He has his own recording studio, "Cooper Lane Studio", where he produces and engineers some of his music, and which is also used by other musicians. He produced a song called "Think of Me" for 2009 "Australian Idol" Stan Walker's debut album, as well as playing most of the musical instruments on the track.