I was interested in how heavily modulated vinyl could be, so I popped
an old record (Long Hot Summer Night, Jimi Hendrix, Track Records
1968) under the microscope for a look. And what did I find? Two
adjacent grooves clearly broken into each other:
http://81.174.169.10/odds/grooves.jpg
Was this a really common back then, or is this kind of thing a rarity?
d