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In addition to WAV files, MIDI files may also be used in the Interactive Music hierarchy. Both file types, once imported, are used to create clips, contained in one or many music segment tracks. In the case of WAV clips, each clip is a self-contained source of sound. However, MIDI clips only contain the musical notes to be played; a MIDI instrument must be used to interpret the notes. The instrument interprets all MIDI events generated by one or many MIDI clips targeting it.