librosa requires keyword argument for sample rate (sr)

genre_recognition.ipynb

@@ -163,7 +163,7 @@
    "outputs": [],
    "source": [
     "# See http://musicinformationretrieval.com/stft.html for more details on displaying spectrograms.\n",
-    "S_brahms = librosa.feature.melspectrogram(x_brahms, fs_brahms)"
+    "S_brahms = librosa.feature.melspectrogram(x_brahms, sr=fs_brahms)"
    ]
   },
   {
@@ -206,7 +206,7 @@
     }
    ],
    "source": [
-    "librosa.display.specshow(S_log_brahms, fs_brahms, x_axis='time', y_axis='mel')"
+    "librosa.display.specshow(S_log_brahms, sr=fs_brahms, x_axis='time', y_axis='mel')"
    ]
   },
   {