"People (2017, Ukraine) usually listen to music from embedded storage"
False. The most popular music player apps were... drumroll... players with subscription.
Apple Music — 21.3%
Google Music — 16.4%
Sound Cloud — 18%
What does it mean and how can I use it?
Now I can define some part of functionality with user stories.
As a user
I want to listen to music from my favorite service
So that I can use my own subscription with a list of songs
Before I got this data I had a blank list, but now it's possible to provide requirements description such as compatibility with popular services (Apple Music, Google Music, Sound Cloud), show favorite lists and libraries in "Binaural player" interface.
How to define what color to use for the UI? Ask when people usually listen to music from mobile devices. The most popular answer was "In the evening", so let it be dark.
Using gathered data I defined color, requirements and main functionality.
During my User research I realized sad thing: almost nobody was interested in binaural effects or portable amplifier. It means the niche of this product is not mass market. To involve average person we need another unique selling proposition.
1. Binaural effects with vibrant animation
2. Binaural hearing test with personalized profile
3. Screenshoter for sharing
For the third one USP the UI of this player should be unique. So I started my prototyping journey.