Amos & Bartellow work together since Fall 2006. Bartellow produced the Album 'Amos - Clumbixes 2008 feat. Bartellow' which was released on Sounds of Subterrania. It was a remixalbum of 'Amos - Imperator of Pop' which came out on Sounds of Subterrania in 2006.
Since Fall 2009 they collaborate under the pseudonym COLUMBUS - Their Debut-EP 'Lovemachine' came out on Estrela Rec. in May 2010.