The side project was created and in the actual line up only features Markus Grosskopf, most notably the bass player for German power metal band Helloween and also a bassist for Tobias Sammet's symphonic metal project Avantasia and classic rock group Kickhunter.
For the project, Grosskopf invited some well-known singing bass players from the German heavy metal scene to join him and record with him.
Those are Tom Angelripper (Sodom), Peavy Wagner (Rage) and Marcel Schirmer (Destruction).
He expected to get a response from two or three musicians, while ended up more than a dozen people to have a solo appearance on the record.
Those include Billy Sheehan, Rudy Sarzo and Lee Rocker.