"Die Gedanken sind frei" (Thoughts are free) is a German song about the freedom of thought. The original lyricist and the composer are unknown, though the most popular version was rendered by Hoffmann von Fallersleben in 1842.

Bilingual Lyrics by Arthur Kevess
Die Gedanken sind frei My thoughts freely flower, Die Gedanken sind frei My thoughts give me power. No scholar can map them, No hunter can trap them, No man can deny: Die Gedanken sind frei! I think as I please And this gives me pleasure, My conscience decrees, This right I must treasure; My thoughts will not cater To duke or dictator, No man can deny– Die Gedanken sind frei! And if tyrants take me And throw me in prison My thoughts will burst free, Like blossoms in season. Foundations will crumble, The structure will tumble, And free men will cry: Die Gedanken sind frei!

Bob Dylan "With God on Our Side"
Audioslave "Like a Stone"

Heresy by nine inch nails or The Fight Song by Marilyn Manson

Beware by Death Grips, too good