Alteration of singing voice and music is an interesting research topic since singing voice contains large information, such as melody, singer's characteristic, lyrics, emotion, etc. All of these sources in singing voice are useful for music knowledge retrieval, singer identification, melody extraction, audio content analysis, or even karaoke gaming. At the same time, it is also a challenging topic because existing methods are still not so practical. Repetition is a special characteristic of

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... c. Most songs have their own iterations. Support structures over which the singers lay varying vocals on them. This work studies the repeating structure of music and implements the algorithm based on the repeating pattern of the music background. Using Robust Principal Component Analysis, the singing voice from music has its advantage of being simple, blind and automatic.