Melkweg offers a year-long pass for only 15 euro. This pass prevents you from paying a membership fee every time you attend one of their many shows and parties. Even better, Melkweg gives free performances to year-long members each month. The announcement arrives by email. An example: this past Sunday, I saw Bonobo, a sold out concert, for free. And it was excellent. The year long pass gives you access not only to concerts, but also to dance and theatre. Just bring a passport photo and 15 euros during the day to the Melkweg to sign up. Looking for upcoming events?
Paradiso offers a year long pass as well, but at 18 euro and without free monthly events, I chose not to take it.