iTunes

In 1998 the American computer engineer and entrepreneur William S. "Bill" Kincaid created the MP3 player SoundJam MP with Jeff Robbin. Two years it was purchased by Apple and renamed iTunes.

Apple launched iTunes on January 9, 2001 at Macworld San Francisco. At first, the service was available only to Mac users and the music files were encoded in Apple's proprietary format restricting where they could be played.

Wikipedia

On April 28, 2003, version 4.0 introduced the iTunes Store; six months later version 4.1 added support for Microsoft Windows 2000 and Windows XP.

Introduced at Macworld 2005 with the new iPod Shuffle, Version 4.7.1 introduced the ability to automatically convert higher-bitrate songs to 128kbit/s AAC. Thanks to the emergence of the iPod, iTunes became the first widely-successful legal music download site.

In February 2006, iTunes reached the incredible number of one billion music song downloads. The billionth song was Coldplay's "Speed of Sound." To celebrate selling it's one billionth song sold, Steve Jobs personally called the customer, Alex Ostrovsky of West Bloomfield, Michigan to inform him he'd won 20" iMac, 10 fifth generation iPods, and a $10,000 iTunes gift card.

"Hey Ya" by Andre 3000 was the first song to be downloaded one million times on iTunes.

There are now over 800 million accounts on iTunes, meaning Apple has access to more credit cards than any other company in the world.

Using iTunes to build nuclear weapons is against their terms of service.