reorganized spectral features and knn exercise

Table_of_Contents.ipynb

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@@ -74,7 +74,6 @@
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      "source": [
       "1.  [Spectral Features](notebooks/spectral_features.ipynb)\n",
-      "1.  [Tonal Descriptors: Pitch and Chroma](notebooks/)\n",
       "1.  [Mel-Frequency Ceptral Coefficients](notebooks/mfcc.ipynb)\n",
       "1.  [K-Nearest Neighbor](notebooks/knn.ipynb)\n",
       "1.  [Exercise: Instrument Classification using K-NN](exercises/knn_instrument_classification.ipynb)"
@@ -92,6 +91,7 @@
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+      "1.  [Tonal Descriptors: Pitch and Chroma](notebooks/)\n",
       "1.  [Feature Extraction](notebooks/feature_extraction.ipynb)\n",
       "1.  [Beat Tracking](notebooks/beat_tracking.ipynb)\n",
       "1.  [Tempo Estimation](notebooks/tempo_estimation.ipynb)\n",
@@ -101,6 +101,14 @@
       "1.  [Exercise: Unsupervised Instrument Classification using K-Means](exercises/)\n",
       "1.  [Exercise: Source Separation using NMF](exercises/nmf_source_separation.ipynb)"
      ]
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