0_Apprentice
Do you enjoy heavy metal music?
1_Wizard
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
0_Apprentice
Oh, interesting. Do you know where else it is popular?
1_Wizard
It became popular in the US with Led Zeppelin, Back Sabbath, and Deep Purple
0_Apprentice
I always forget about Deep Purple. Do you like them?
1_Wizard
I do not know much of their stuff but they were the Guinness Book of World Records loudest band in 1975.
0_Apprentice
Oh, wow. I wonder how they measure the 'loudest' aspect. 
1_Wizard
I do not know but it was due to a concert they played at London's Rainbow theatre.
0_Apprentice
Have you ever been to London's Rainbow theater?