From what I know about record manufacturing, creating the lacquer master would involve adjusting the angle of the groove to allow for two concentric grooves to be laid, along with some care in creating that master. But once it’s done, the manufacturing process is handled through a stamping process (so a vinyl record isn’t cut, it’s pressed with a metal die that’s created from the lacquer master through electroplating).
replyYou’d cut it normal equipment, with very wide groove spacing. Start the two grooves 180 degrees out of phase. They’ll never intersect.
replyYou could do it with more than two grooves, just to having them at 360/n degrees apart. You’ll just have to make the groove spacing wider as the number of tracks go off. Of course that comes at the cost of playback tine.
A Porky prime cut.
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replyWhen I was a kid, we had a "record producer" board game and the randomizer was a 45rpm record with three concentric grooves. You did a needle drop and it said It's a Hit, It's a Flop, or Break Even.
replyEDIT- Apparently it was the K-Tel Superstar game
https://boardgamegeek.com/boardgame/4521/k-tel-superstar-gam...
De La Soul's 12" Single for "Me Myself And I" also has its second side cut with two grooves. The hype sticker says, "3 Sides." Each time you put the needle down you have a 50/50 chance to hear the song you're trying to hear. :-)
replyhttps://www.discogs.com/master/19554-De-La-Soul-Me-Myself-An...
The same goes for the 1994 first pressing of Marillion's Brave.
replySide 4 has a double groove, which would give you either The Great Escape + Made again (a sort of a happy ending) or The Great Escape + 20 minutes of water sounds (which can be interpreted as the sad ending).
Reference: https://en.wikipedia.org/wiki/Brave_(Marillion_album)#Vinyl_... (I also have a copy and can confirm indeed it works like that).
Monty Python’s Matching Tie and Handkerchief Executive Version.
replyI bought a Record Store Day release of Ella Fitzgerald live in Berlin that did this around 2020. Very cool stuff.
replyJack White did something similar with Lazaretto.
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