There are quite a few consumer EEG headsets now: 
<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Comparison_of_consumer_brain%E2%80%93computer_interfaces" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Comparison_of_consumer_brain%E...</a><p>Would it be possible to train the music against user-collected EEG data (coupled with cognition tests or sleep data)?