MIDI (short for Musical Instrument Digital Interface) is a music industry standard communications protocol that lets MIDI instruments and sequencers (or computers running sequencer software) talk to each other to play and record music. More and more of the music you hear every day is written with and played by MIDI sequencers.

MIDI is:

Compact - Hours of music can fit on a single 3 1/2" floppy disk, thousands of songs on a CD
Efficient - Just about any computer can handle it
Powerful - A whole orchestra is at your command
Versatile - A click of a button is all it takes to change key, tempo, instrument, etc.
Intuitive - a MIDI file is just an electronic version of a player piano roll for many instruments
Portable Industry Standard - Any MIDI instrument can talk to any other

Who needs MIDIs?

-Students
-Music Teachers
-Performers
-Producers
-Composers
-Arrangers
-Hobbyists
-Music Lovers