Today, headphones set the standard for the ultimate portable - and personal - way to listen to music. And with good reason: ever since the first stereo headphones were produced in the 1940's, ear-to-ear audio has seen drastic improvements in technology, quality, and selection. Before that, early headphones were used primarily in the world of communication; radio, telegraph, and telephone operators relied on them long before modern DJ's and mixing engineers did. Luckily, headphones have come a long way since Nathaniel Baldwin made the first pair by hand in his kitchen in 1910 (The US Navy ordered 100 pairs prior to WWI). What was once a crude, uncomfortable listening experience is now a revelation of clarity, comfort, and privacy.