Rehearsal.
"A rehearsal is a preparatory event in music, theatre and in other contexts that is performed before
the official public performance, as a form of practice, and to ensure that all details of
the performance are adequate for professional presentation."

Recording??
Helmettes fan and Dutch Punklegend Bertje Brood did the right thing:

A 1/2 2 TATTOO
(and Dr. Rat too)