Quicktime and RealPlayer developed "streaming" music - which would use an HTML tag to trigger the launch of their application on the user's computer, and the music would be piped in and played through.
It provides animation control, database integration, a complete scripting language (called "ActionScript") and even integrates with many other web technologies such as XML and Quicktime.
One of the earliest delivery methods took advantage of the embedded Musical Instrument Digital Interface (MIDI) in Apple's popular media player Quicktime.
You'll need to have Quicktime installed to view the site in its entirety, but either way you can download some of these great graphics for free.
They give you several options for how you want to listen to their tunes, including MP3, Ogg Vorbis, Real Audio, Windows Media, and QuickTime.