Completed the following sentence: Nazrul used his music as a major way of disseminating his revolutionary notions, mainly by the use of strong words and powerful, but catchy, tunes. Nazrul used his music as a major way of disseminating his revolutionary notions, mainly by the use of strong words and powerful, but catchy, tunes. Among the revolutionary songs, "Karar Oi Louho Kopat" (Prison-doors of Steel) is best known and has been used in several films, especially those made during the
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