**4. Separation of audio and music signals**

Since the separation of audio and music signals is more complicated than classification, in this section we will introduce only two approaches [7–13, 22, 76, 77, 86, 135]. The first approach is the approach of independent component analysis (ICA) with ANN. The second classifier is the pitch cancelation approach. A block diagram of a classifier integrated with a separator is depicted in **Figure 19**.
