>> here the left side of the ork orchestra from the left, the right from the right. low as $129.95 at your rca victor dealers. >> that's $1,000 in today's money. in fact my smartphone essentially replaces everything in this radio shack ad and this stuff costs more than $5000. and even that was already an improvement, thanks to rapid creative destruction in the music industry. the stereo replaced the gramaphone and record players then came cassette players, boom boxes, smaller boom boxes and much smaller boxes. >> take a cassette out of its case and most see an empty pox. sony saw something quite different. ♪ sony introducesen the only