might come in handy one day

In 1989 the American musicologist Alan W. Pollack started to analyze the songs of the Beatles. He published his first results on internet. In 1991 -- after he had finished the work on 28 songs -- he bravely decided to do the whole lot of them. About ten years later, in 2000 he completed the analysis of the official Beatles' canon, consisting of 187 songs and 25 covers. Here we have ordered this massive work in five categories.