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"Glass Walls of Limbo" is a song by Type O Negative, included on the first album Slow, Deep and Hard, released in 1991. The track does not have singing voice nor even a metal riff. Instead it comprises the sound of broken glass falling on the metal floor repeating constantly over church-like choir, sometimes interrupted by raspy shrieks. It can be considered the most humorous track of the album. The track title suggests that on the other side of the walls made of glass is limbo, which is an imaginary place where dead people go in order for them to be deleted from history, causing family and friends to say that person is no more than a figment of imagination.
Of the six tracks on the album that has sounds recorded in them, "Glass Walls of Limbo" is the only one that is not split into cantos. "GWOL" is a Dance mix even though it does not feature dancing in them.
Lyrics 
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[Instrumental with choir]
Personnel Edit
Group performers
- Peter Steele – choir
- Kenny Hickey – choir
- Sal Abruscato – voice
Session performers
- The Bensonhoist Lesbian Choir – choir
Enginucers
- Mike Marciano – engineering, mixing
- Josh Silver – sound effects
- Michael Sarsfield – mastering
- Type O Negative – production
