Why can't I find my purchased music track on iTunes?

Some time ago, I noticed that the intro song on Sgt Pepper's Lonely Hearts Club Band was missing from the album I had uploaded to Music or iTunes. It is called Sgt. Pepper's Lonely Hearts Club Band, just to add to the confusion. I solved the problem by purchasing it from Apple some time ago but I can't find it: the album annoyingly starts with "Lucy". I bought the album on the day it was released so remembering it as it was is quite important to me. I don't want to buy it again especially as there might be a software error at play.

[Re-Titled by Moderator]