WATCH: Brain May and Tony Iommi Talk Guitar Riffs

Brian May and Tony Iommi recently talked guitar riffs and covered a Black Sabbath classic for a new British documentary series.

The series is called "Greatest Guitar Riffs" and it's now available to watch here in the US with a subscription to Now TV.

You can check out the May and Iommi segment below, or over on the Guitar World YouTube channel!

Photos: Getty Images

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