In this exclusive clip from Sky Arts' Greatest Guitar Riffs, Queen guitar legend Brian May solos over Black Sabbath's Paranoid, accompanied by his friend Tony Iommi.
Greatest Guitar Riffs is available to stream on NOW: https://www.nowtv.com/watch/greatest-guitar-riffs/iYEQYZHWrEf3mik45YZgPo/iYsxVPbHDwPSfxAVgprbcA/seasons/1