Because not every album hits the nail on the head
Even great artists have albums that don't quite hit the mark. For some, they release so many that it would be almost impossible for all to be received with the same level of praise.
That doesn't mean, however, that every song on that album is below par. Often there are great songs that history leaves behind, held back by the low standard of the music around them. Sometimes it can be the other way round, with a great single leading to a hugely anticipated album that is a disappointment to everyone.
We thought it would be good to retrieve some of those songs that time forgot, along with others that were huge, only for the subsequent album to let them down.