Career
In Tampere he is known as "Ikurin turbiini" ("the turbine of Ikuri)."
Mustajärvi appears on the 1984 film Calamari Union by Aki Kaurismäki, playing one of the fifteen main characters named Frank. In 2004 Mustajärvi performed two songs on the soundtrack of the Finnish action/thriller film Vares - yksityisetsivä.