He wrote the lyrics to "Talking to a Brick Wall", "Into My Arms" and "In Your Prime" for their 2003 album Kick Up the Fire, and Let the Flames Break Loose.

Bellamy eventually expanded into keyboards and synthesisers, gradually beginning to represent The Cooper Temple Clause as a DJ at post-gig slots (with bandmate Jon Harper) and other events offered to him.

Throughout the period prior to the release of the band's third studio album Make This Your Own, Bellamy was influenced by the music of acts such as Soulwax and Simian Mobile Disco to further pursue remixing.

Following the split of the Cooper Temple Clause in April 2007, Bellamy began writing original material under the alias of Rhysmix, including the track "Feared by the Other Children".

The demise of his old band prompted Bellamy to continue to pursue his musical interests through the medium of Rhysmix, a premise supported by an increasing number of DJ sets under his new alias.