In my last communication I stated that I thought the difference between my two relative frequencies was not significant. I think I have now performed a test, but whether it is valid or not can be up to you.
If Heavy Metal focuses on the dark side of life then there should be many references to to Hell in the song title. Conversly, there should be only a few references to the term Heaven in song titles. If this is the case then it could be expected that the frequencies of each would be independent of each other, assuming the subject matter for songs is random and the use of words follows this.
My Calculations follow, but essentially I have found that, at a 5% significance level, the distribution of Hell and Heaven is random and that the frequency of hell is close enough to the frequency of heaven for this to be so.
I am fully aware that I have really pushed the limits of my significance test and it probably doesn’t even work properly for this type of problem. But, my happiness about this communication remains about 75% (+- 3% for 95% confidence level).