The friendship of Benoit and Sylvicious started in a French black metal band called Mandragor.

By touring Europe extensively they made a name for themselves due to their harsh, grinding elektro which manages to mix the genre in its essence and the atmospheres of black metal.

In 2005 they released the mega hit Le Son de la Pluie (The Sound of the Rain) on the Alfa Matrix compilation Endzeit Bunkertracks: Act I.

In late 2005/early 2006 Tamtrum entered the studio to record the album Elektronic Black Mess and this for their new label Alfa Matrix.

The line up for this album included the whole band and also holds guest vocals by the ex-Anorexia Nervosa singer Rose Hreidmarr.