What thing, law, or person was most responsible for spreading Boogie, Jump Blues, R&B and Beach Music to the world? Was it the piano, sheet music, Pullman porters, gypsies? Nope. It was ornate, colorful, laced with chrome, bright lights and had a mechanical arm which gently moved shellac 78 rpm disks. It was that cathedral of sound and lights, the JUKEBOX.  One thin dime and the band played your request. And around 1950 with the innovation of the 45 rpm, it became our main entree to music.