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A multisided record is a type of vinyl record that has more than one groove per side. This technique allows hidden tracks to be encoded on LPs, 45 rpms and 78 rpms. On a disc that has a multi-groove, whether the listener plays the main track or the hidden track depends on where the stylus is cued.
The most frequently cited example of a multiple-groove record is Monty Python's infamous "three-sided" Matching Tie and Handkerchief album, issued in 1973. [1] One side of the album (both sides were labeled "Side 2") was "normal"; the other contained a pair of grooves, each of which held different material (later pressings of the record did not include the double groove).
Another memorable example of a multiple-groove recording was the 1980 flexi disc entitled It's a Super-Spectacular Day issued by MAD magazine. [1] The disc played a standard introductory section about the start of a wonderful, "super-spectacular" day, then produced one of several different comedic "bad" endings to that day, involving such topics as alien abduction, zits, street violence, and the horrors of a visiting mother-in-law.
Other uses to which multiple-groove recordings have been put include various games (such as horse races or mystery games) where the outcome is determined by which of the record's multiple grooves is played.
Some records to have incorporated this feature, include:-
When heads cleared at last week's M.O.A. convention in Chicago, it was the record with four endings that every coin op was talking about....
The album [...] is originally released as a three-sided record; that is, one of the sides has two parallel sets of grooves, each containing a different set of tracks.
If you ever find a copy of the 12" single, certain versions were double grooved, so it was pot luck whether you got the A or B side depending upon where you placed the stylus on the record. Others had a closed groove at the end so the final word of the song, 'clear', played repetitively.
a twin grooved single recorded live at the marquee and messed about with at moinair (liner notes)
... one side was mastered with two concentric grooves. When the listner plopped the [stylus] onto the disc, he didn't know which of the two tracks he would hear.