Speed of Sound

When we're talking about sound that spins, one of the most vital things to know is just how fast that spinning is supposed to be.  When recorded music first started, it was FAST.  This is because early inventors of the technology figured out that a higher speed meant greater sound quality...but the faster it went, the less you could record on it.  So the speed of records has always been a delicate balance between fidelity and recording length.  When disc recordings started coming for the cylinder record business, Edison fought back with a brand of recordings called Blue Amberol, so named because they were made of...celluloid (you thought I was going to say amber, but the reason for the name is lost to history).  These spun at 160 rpm and could hold an entire 4 1/2 minutes of sound!  Find the opera whose overture became the very first release on Blue Amberol for your first code!