MIDIenablespeopletouse()computersandelectronicmusicalinstruments.ThereareactuallythreecomponentstoMIDI,thecommunications"()",theHardwareinterfaceandadistribution()called"StandardMIDIFiles".InthecontextoftheWWW,themostinterestingcomponentisthe(请作答此空)Format.Inprinciple,MIDIfilescontainsequencesofMIDIProtocolmessages:However,whenMIDIProtocol()arestoredinMIDIfiles,theeventsarealsotime-stampedforplaybackinthepropersequence.MusicdeliveredbyMIDIfilesisthemostcommonuseofMIDItoday.
A.Video
B.Faxmail
C.Graphic]
D.Audio
正确答案是D