Completed the following sentence: In August and September 1979, the Clash recorded "London Calling". Produced by Guy Stevens, a former A&amp;R executive who had worked with Mott the Hoople and Traffic, the double album was a mix of punk rock, reggae, ska, rockabilly, traditional rock and roll and other elements possessed of an energy that had hardly flagged since the band's early days and more polished production. The title of the track also happened to be heavily influenced by the BBC World Service call signal and the panic that resulted in the
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