It is proprietary I guess, but I don&#x27;t really mind talking about it :) I did a talk recently at Northwestern (The Garage) and they were interested, so I spilled the beans. I&#x27;d like to get that talk up actually.<p>I used the Bach&#x27;s harpsichord concertos - Allegro&#x2F;Presto&#x2F;etc, since we&#x27;re doing focus in that case. It&#x27;s actually the 2nd most popular theme on the site! I made that one for myself to be honest - I grew up with those things and it was a labor of love, that one. Took some major reconfiguring, but it was worth it I think.<p>You&#x27;re definitely not listening to the same thing each time. There&#x27;s a huge variety. It doesn&#x27;t generate the sessions in real-time (audio processing of this kind is very, very CPU intensive), but we take the data we get and process it for later use. At this point there&#x27;s so many sessions &quot;cached&quot; that you get huge variety right off the bat and we&#x27;re building up an infrastructure to create more sessions faster<p>I&#x27;ll be adding more &quot;themes&quot; later. To explain, in some cases there are sessions that use a specific protocol, like the harpsichord one. That&#x27;s static. But other themes are more flexible, and so different protocols can be used for the same theme. By protocol I mean what we&#x27;re actually trying to stimulate in the brain.