Police fear the music will foment right-wing sentiments in Germany
German police have seized thousands of recordings of suspected neo-Nazi music during raids across the country.
More than 200 flats and offices were searched, and police said they had confiscated about 45,000 recordings, more than 170 computers and 70 weapons.
The raids are part of a long-running investigation led by prosecutors in Stuttgart, involving some 204 suspects.
The production and sale of music that promotes an extremist agenda or racial hatred is illegal in Germany.
Siegfried Mahler, Stuttgart's chief prosecutor, said right-wing extremists used music to "awaken interest and win support".
"Using aggressive, xenophobic, anti-Semitic and anti-democratic lyrics, they spread extreme right-wing ideas," he said in a statement.
Police said there were 204 suspects - all of whom were between the ages of 21 and 45 - but no-one had been arrested.