Chord Composer is a multimedia music composer software with automactic accompaniment function, with Builtin 100 accompani-ment styles make it easy for the user to quickly design a perfection song. Edit main melody by 1 or 2 tracks in one song. Select rhythm styles and section method. Choose the chord type to edit the music. Midi-files created simply and import & export. Select the midiout device convenient. ChordComposer software simulates the chord auto accompany of electronic organ to edit music in computer and changes the music file into MIDIfile formation easily. The interface is designed very simply and visibility. People could hardly use the operation guide to compose the music in it. But the composed music is very melodious. It is a perfect selection for beginners who wishes to learn about basic knowledge of staff, harmonic, music theory,etc. It is also an assistant course for learning Computer Music. The whole windows editor of the ChordComposer is divided by two parts. The editor of up- part is to edit main melody, and the down-part is a chord window. The intuitive input of staff musical notation make you input notes more quickly and easily. By editing them in one or two melody tracks and select one of the style of chord, a professional music file will be done simply. The ChordComposer supports the MIDI files import or export. There are 100 styles in software, you can select more then one style on one song for accompany. you can select one of "Inte, Normal, Bridge, Fillin1, Fillin2, Endinf" section for each style. With this styles, you just edit the melody track for any song. The intelligent lyrics input function makes it easy for the user to produce lyrics. Importing and exporting from/to MIDI,and the user can further refine it with the help of other musical softwares.