“...Frank wrote the lyrics to it in Stockholm. I heard it in various bits and pieces, but never in an arrangement that I thought was quite appropriate for it. Frank’s not up on his thrash metal, so he suggested to me one night, “Why don’t we do Dragon Master?” So I wrote the ugliest music that I could possibly write. It’s meant to be done as a bit of a joke, really. It’s a send up of speed metal and all that stuff.” – Dweezil Zappa, 8 May 1991
The complete interview with Dweezil can be found in Andrew's book Frank Talk: The Inside Stories Of Zappa's Other People (Wymer UK, 2017).
Photo of Dweezil in his Holiday Inn hotel room taken by the Idiot Bastard.