Watching this year’s Grammy Awards, it’s clear hip-hop is the dominant genre in popular music. But back in the ’80s, it was an influential but still underground style looking fora place on the charts and  some mainstream respect. That is, until Run-DMC met Aerosmith. This month, how some out-of-favor ’70s rockers teamed up with the top crew in rap to remake an old hit—in the process, opening lanes for a trio of punks-turned-MCs, and a witty hip-hop lothario. We’re still feeling the reverberations today. 

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