Do you enjoy heavy metal music?
I have not listened to much of it but I know it got its start in the 1970's.  It was largely happening in the UK
Oh, interesting. Do you know where else it is popular?
It became popular in the US with Led Zeppelin, Back Sabbath, and Deep Purple
I always forget about Deep Purple. Do you like them?
I do not know much of their stuff but they were the Guinness Book of World Records loudest band in 1975.
Oh, wow. I wonder how they measure the 'loudest' aspect. 
I do not know but it was due to a concert they played at London's Rainbow theatre.
Have you ever been to London's Rainbow theater?
I do not but Sweet Live released an album full of live tracks that they played there.