Why isn't iTunes shuffle random?

This is a problem that has bugged me for the last 5 years, across multiple devices, operating systems and installs of iTunes and iPods. I have found that the iTunes shuffle feature does not randomly shuffle songs. In fact, I can accurately predict the exact sequence of songs that iTunes will play. This frustrates me to no end because I like to listen to my music randomly, but I have a few favourit

[tmatsuu]

iTunesのシャッフルは最初にランダムに並び替えるが、以降はその並び順に再生を続けるので完全なランダムではない。仕様です。