Ever since the time of Edison, the media on which music is recorded has been a source of fascination to us. From wax cylinders to old lacquered 78s to 45 RPM singles and 33 RPM LPs to compact discs, we’ve wondered: just how do these things produce sound? This enduring technological mystery has prompted some rather interesting tales.

Red bullet
Coloring the rims of CDs with a green marker improves their sound quality.

Yellow bullet
The maximum length of CDs was based on Beethoven’s 9th symphony.

Green bullet
A “record-reading” man can identify music by examining record grooves.

Green bullet
Records with more than one groove per side exist.

White bullet
Musician masters dual-guitar part using only one guitar

Red bullet
The Library of Congress is transferring its entire audio collection to 78 RPM platters.

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