Excellent tutorial on how to make great sounding samples.

Information on how to legally use music samples.

In-depth information about music and copyright law.

In-depth information about digital sampling, copyright, etc.

Basic introduction to MIDI. This site also has lots of other information relating to Computer Music, Digital Audio, and Acoustics.

Collection of articles to help explain what MIDI is.

Search engine that specializes in finding MIDI files.

Detailed information about the MIDI format, its origins, and uses.