Black Sabbath's all-star farewell concert took place in Birmingham, England Aerosmith's Steven Tyler joined a supergroup house band including Rage Against The Machine's Tom Morello and Red Hot Chili Pepper Chad Smith for "Walk This Way." ►► Subscribe for more music news: http://blbrd.cm/Proracf ►► See our latest videos: http://blbrd.cm/xOgw6VQ About: Billboard is the world's most influential music media brand, with an unmatched authority among artists, fans and the industry. Billboard powers

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