If you are looking for a technical term it is "pregap". The article states:
Not all CD drives can properly extract such hidden tracks. Some drives will report errors when reading these tracks, and some will seem to extract them properly, but the extracted file will contain only silence.
There is also a list of albums with tracks hidden in the pregap in ...
Jack White has a habbit of including hidden tracks and other features. Here's for instance his latest album Lazaretto:
The 11-track album on White's label Third Man Records, includes
different mixes and sequencing to the digital version, and will play
at 33.3rpm as normal. However two secret tracks hidden in the centre
label will play at 45 and ...
Monty Python's Matching Tie & Handkerchief may qualify, as entire sides were 'hidden' by two methods.
Both sides of the album had the same label, claiming it was 'Side 2'
One side had dual concentric grooves, so which tracks you heard was dependent on which of the two grooves you hit when dropping the needle.
It was referred to at the time as a 3-sided ...
C+C Music Factory's Gonna Make You Sweat album on cassette had a hidden track. The cassette said that "Bang That Beat" was the final track on the tape, but if you let the cassette continue playing for about 20-30 seconds past the end of that song, then you heard the "Shade" song start playing.
The cassette release of Pulse by Pink Floyd contains a 22-minute hidden track titled Soundscape (Cassette 2, Side 4) that starts a few minutes after the last listed track Run Like Hell.
"Wish You Were Here" 6:35
"Comfortably Numb" 9:29
"Run Like Hell" 8:36
"Soundscape (Ambient piece played before all concerts)" 22:00
In case of vinyl, the ...
One of the first and most famous hidden tracks is on The Beatles' Abbey Road. "Her Majesty" begins 14 seconds after the last song listed on the album jacket ("The End") and runs 23 seconds long. It is often considered the first example of a hidden track in recording history. Released in 1969, this was long before CDs.
There have been lots of albums ...
From Mew's album No More Stories Are Told Today, I'm Sorry They Washed Away // No More Stories, The World Is Grey, I'm Tired, Let's Wash Away, the track New Terrain, when played backwards, is a different song called Nervous. I'm not sure if it strictly qualifies as a "hidden" track - it was added as a bonus track on the vinyl edition, but since it's the same ...
According to the wikipedia entry about the 'No rest for the Wicked tour' the song did not feature on the tour.
On a fan website, "ysis2" offers this explanation
I think this song kinda correlated to the John McCollum suicide
lawsuit brought against Ozzy around 1987 (Another similar situation
around this time occurred with Judas Priest where they ...