I want the ability to rate music across multiple user-configurable dimensions. Add tags. Create smart playlists that interpolate between these.
I want to be able to pay a fee to subscribe to music discovery, then be able to mix these with my own library. If I really like a track, I'd like to buy it and add it to my collection.
I want an open API so desktop apps can be written to use it. Also, let me export my annotations and music library on demand.
Music for power users. Don't give me a single button. Give me hundreds of them.
I'd pay $30/mo or more for this.