If you make donations or pay membership fees to organisations promoting cultural purposes, you can deduct these from your taxes. Your donations are deductible if they go to organisations or associations that support cultural institutions, as well as their supporting associations, e.g. theatres, museums, music schools.
Currently, the Cologne Fiscal Court has ruled that charitable music associations that do not provide training as a secondary activity may issue donation receipts for membership fees paid, and the donor receives a tax reduction for this (FG Cologne, 25.02.2021, 10 K 1622/18, appeal pending under X R 7/21).