of the CD. This essentially renders them inaccessible without taking the sleeve apart, hiding the glossary in a parallel way to the song itself. A less concealed method is to place the song at the end of another track, typically the last track on the album, following a period of silence. For example, Nirvana's song "Endless, Nameless" was included as a hidden track in this way on their 1991 CD Nevermind, after 10 minutes of complete silence within the track listed as the final song. Although it was not the first hidden song to use this technique, it gained significant attention. Similarly, short tracks of silence can be layered before the hidden track plays. On Lazlo Bane's debut album, 11 Transistor, the eleventh song is followed by 57 silent tracks four seconds each, with "Prada Wallet" (sometimes referred to as "The Birthday Song") being the 69th track on the album. The total length of silence between the two songs is 3:48. It is possible for a track to be playable only through a computer, such as the '15th' track on Marilyn Manson's Mechanical Animals album, which can only be accessed through an Enhanced CD executable. There are yet-deeper ways a track can be hidden. A "ghost" track can be subtly mixed to play concurrently with other, dominant audio, or heavily distorted in a way which must be undone to be played. For example, on a DVD included with the deluxe and 'ultra-deluxe' editions of Nine Inch Nails' Ghosts I–IV, two hidden bonus tracks ("37 Ghosts" and "38 Ghosts") are included as digital multitrack files, from which the songs may be reconstructed. Reasoning Aaliyah's self-titled album Aaliyah features the hidden song "Messed Up" on track 15. During the stages of the album creation, Aaliyah had no desire to put this song on the album, but after numerous inquiries from different labels and colleagues, she decided on making it a hidden track. In some rare cases, it is used to avoid legal issues. An example is Ramones' Loco Live American version, which has the song "Carbona Not Glue" hidden after Pet Sematary on track 17. It was originally recorded on their album Leave Home, but the makers of the spot remover Carbona, a registered trademark, objected. Therefore, reference to the song was removed from the album and cover. "Freedom" by Paul McCartney was a hidden track on the original release of Driving