If you plan to use MIDI extensively, you may want to develop the expertise in-house to create and refine musical compositions with MIDI. With this approach, you gain complete control over the development of the music. You also eliminate royalties and copyright issues that accompany the use of existing music.
Along with qualified personnel, you'll need tools: a keyboard synthesizer to compose and play the original score and a computer with a MIDI sequencer program to record the timing, instrumentation, and multiple tracks of the composition. The next section discusses the types of hardware and software you'll need.