Harris is known for his involvement in a wide range of projects, including grindcore originators Napalm Death, industrial hip-hop innovators Scorn, dark ambient solo project Lull, and free jazz/metal trio Pain Killer. In 1995, he released an untitled 12" of experimental techno tracks under the name Fret. The EP was the only record to be released on Resonance, a sublabel of notable Birmingham techno label Downwards. After the EP was released, Harris switched to the name Monrella for his techno recordings, and he released several 12"s on ZET, a label founded by Karl O'Connor (Regis). Nothing further was heard from Fret until an untitled, previously unreleased track from 1995 was included on Downwards' 2013 compilation Halha. Objekt included the Fret track "Stuck" on Kern, Vol. 3, his 2016 mix for Tresor. The following year, his first full-length, Over Depth, was released by German label Karlrecords. The release contained some of the heaviest, most complex beat excursions Harris had created since retiring Scorn in 2011. The album was followed by the equally intense Silent Neighbour EP, which appeared on L.I.E.S. in 2018. 2019 saw an EP of remixed versions of his 2017 track "Salford Priors." ~ Paul Simpson, Rovi