As I write this paragraph, I'm enjoying a playlist that I created from among the thousands of songs on my iPhone, and it's no big deal. It wasn't always so simple: Once upon a time, crafting the perfect playlist for your MP3 player felt like an epic project. You had to rip the songs from a CD onto your computer, find sources--legitimate and otherwise--for tracks you didn't own, and then hope everything was in the right format to play on your portable device. Apple changed all that, thanks to a series of musical moves right at the dawn of the 21st century--not the least of which was the launch of the iTunes Music Store.Related StoriesYour next smartphone could have a projector, courtesy of Lumiode LED microdisplays
