Hidden music. Some albums[1] have hidden tracks.[2] [1]: https://en.wikipedia.org/wiki/List_of_albums_with_tracks_hidden_in_the_pregap https://en.wikipedia.org

Hidden music. Some albums[1] have hidden tracks.[2] [1]: https://en.wikipedia.org/wiki/List_of_albums_with_tracks_hidden_in_the_pregap https://en.wikipedia.org/wiki/List_of_albums_with_tracks_hid... [2]: https://en.wikipedia.org/wiki/Hidden_track https://en.wikipedia.org/wiki/Hidden_track