Modern music sources include Napster and iPod. Napster is a music streaming service that was founded in 1999 and allowed users to share music files with each other. It was the first major peer-to-peer file sharing service and was eventually shut down due to copyright infringement. The iPod, released by Apple in 2001, revolutionized the way people listen to music. It was the first digital audio player to use hard drive storage and allowed users to store and play thousands of songs on a single device.