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In page Socialist realism:

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Hanns Eisler composed many workers' songs, marches, and ballads on current political topics such as Song of Solidarity, Song of the United Front, and Song of the Comintern. He was a founder of a new style of revolutionary song for the masses. He also composed works in larger forms such as Requiem for Lenin. Eisler's most important works include the cantatas German Symphony, Serenade of the Age and Song of Peace. Eisler combines features of revolutionary songs with varied expression. His symphonic music is known for its complex and subtle orchestration.[citation needed]