It is meaningful to combine melody based retrieval and text based retrieval for the music database and music digital library.

Since the length of a repeating pattern is much short than that of a music work, and many user’s queries are aimed at repeat patterns, therefore, using repeating patterns as music databases index may improve systems performance greatly.

As a sort of newly emerging object digital music education is stepping into universities gradually.

To meet the needs of digital music teaching,the paper attempts to propose the feasibility of designing staff composing music tool,which based on VC circumstance,this paper also proposed detailed solutions for its technical theory and key issue.

The constant perfection of the digitized music environment has already brought the opportunity for the reform of music basic course teaching,put forward the new request for the course teaching of sight-singing and ear training,too at the same time.