Seems interesting, but why don't you give premium to everyone who signs up for at least the first day/week?
How can I tell if I will like it if I can only listen to piano without signing up for yet another service.
You can listen to a lot more categories than you previously described. Here's a code for 30% OFF in case you decide to upgrade: "WLCOFF".
By making science-based music accessible to people everywhere in the world at the time it matters most, we empower individuals to live a more productive and efficient life.