The digital piano collective class teaching system includes computermusicsystem, phonetic order system in teacher's piano, the digital piano MIDI music teaching machine and teaching video system.
Music is one of important social subjects, and has plenty of domain knowledge, which is necessary for musical computer application system of music.
音乐是一门重要的社会学科，具有丰富的领域知识，这些知识是计算机音乐应用系统所需要的专业知识。
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No DRM system was ever developed for the CD, so all the music distributed on CDs can be easily uploaded to the Internet, then (illegally) downloaded and played on any computer or player.