Thanks to @keunwoochoi, there is now a Keras application for music auto-tagging: https://keras.io/applications/#music-tagging-and-feature-extraction-with-musictaggercrnn …
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('jazz', 0.29446), ('electronic', 0.16956), ('chillout', 0.16762), ('ambient', 0.10534), ('electronica', 0.06545)
it's going to be heavily biased towards the distribution of the training data. Trained on Million Song Dataset.