AHC:Make 8-tracks the standard music format

Atomic war in 1978? That'll also save CB Radio.

Lack of evolution to cassette technology as the portable format?

Problem getting the material to make cheap vinyl records?
 
Global screwdriver shortage. We were using them to wedge the 8-track tapes a little closer to the head when they started skipping. God I'm old...
 
The U.S. elects an extreme protectionist in 1976 such that when the Sony Walkman is imported in 1979, it's three times as expensive and never catches on?

You'd probably also need some sort of domestic subsidy for Q8 to make this work.
 
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